diff --git a/docs/assets/images/board-images/easy-piezi/pp-v2.1.2-uart-wiring.jpg b/docs/assets/images/board-images/easy-piezi/pp-v2.1.2-uart-wiring.jpg
new file mode 100644
index 0000000..1261f89
Binary files /dev/null and b/docs/assets/images/board-images/easy-piezi/pp-v2.1.2-uart-wiring.jpg differ
diff --git a/docs/assets/images/board-images/easy-piezi/pp-v2.1.2-uart-wiring.png b/docs/assets/images/board-images/easy-piezi/pp-v2.1.2-uart-wiring.png
new file mode 100644
index 0000000..69d7101
Binary files /dev/null and b/docs/assets/images/board-images/easy-piezi/pp-v2.1.2-uart-wiring.png differ
diff --git a/docs/changelog.md b/docs/changelog.md
index 0ab2c9e..523d65e 100644
--- a/docs/changelog.md
+++ b/docs/changelog.md
@@ -1104,4 +1104,168 @@ Changelog updated 2019-10-30_18-51-54
 - Merge pull request #59, implement "fast" pin operations [view commit](http://github.com/pyr0ball/pyr0piezo/commit/bcc7b254848091533b7deb3d211f6bcc399fe6ba) 
 
 
+------------------------------------
+### v2.1.5 to v2.1.6
+
+Changelog updated 2019-12-28_03-43-10
+
+ *Added Features*
+
+- Adds support for inverting trigger logic.   [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5b8c409c109954ea520e5c1e6de9c1f0834889c2) 
+
+
+------------------------------------
+
+ *Bugfixes*
+
+- Fixed width of thermals on singledisk adapter  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/024c6f79111242985d1ce0a0b3ad4358f0d885bf) 
+
+- Fixed pad thermals, added url, fixed logo  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/041836b40b0e0d6fce617c9f73365e8ca9ecb076) 
+
+- Fix for gain adjustment  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/94e2c127951575f3847e72235969a1623eac13a4) 
+
+- fixing serial input not taking effect immediately  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/4076423e1babf8e6e45f1878481dfe42f29fe211) 
+
+
+------------------------------------
+
+ *Documentation Updates*
+
+- Documentation update for v2.1.5  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5d72861a36e1e76c1264d3bc8b02479edc6d3979) 
+
+
+------------------------------------
+
+ *Full Changelog*
+
+- Documentation update for v2.1.5  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5d72861a36e1e76c1264d3bc8b02479edc6d3979) 
+
+- These code changes are for resetting the config values to the default values by issuing the ERASE word via a serial terminal. [view commit](http://github.com/pyr0ball/pyr0piezo/commit/106e6c85c3c5f97e20d947a8b6ea3a6f8f30a268) 
+
+- Merge pull request #60 from klcjr89/master [view commit](http://github.com/pyr0ball/pyr0piezo/commit/9ae410f011c43e5bf4ccb902ef1734d0a61edb28) 
+
+- Fixed width of thermals on singledisk adapter  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/024c6f79111242985d1ce0a0b3ad4358f0d885bf) 
+
+- Fixed pad thermals, added url, fixed logo  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/041836b40b0e0d6fce617c9f73365e8ca9ecb076) 
+
+- Merge branch 'master' of https://github.com/pyr0ball/pyr0piezo [view commit](http://github.com/pyr0ball/pyr0piezo/commit/cd3503beb31c346c0f0f1a1cc53c6ba1a06c57a3) 
+
+- Merge branch 'master' of https://github.com/pyr0ball/pyr0piezo into develop [view commit](http://github.com/pyr0ball/pyr0piezo/commit/64550544467b6e2e5627938338ac63c5a39c5b9b) 
+
+- removed file that shouldn't be tracked [view commit](http://github.com/pyr0ball/pyr0piezo/commit/4f3558b79198da40932a678d410cca57b1e0d801) 
+
+- slight edit to platformio.ini, added dependencies [view commit](http://github.com/pyr0ball/pyr0piezo/commit/bc2de746b469d2f04452b55baafd523cc7e335da) 
+
+- Merge branch 'master' of https://github.com/pyr0ball/pyr0piezo into develop [view commit](http://github.com/pyr0ball/pyr0piezo/commit/407c9834d1c8e9db58041ba84cbe5064d64e20d8) 
+
+- Adds support for inverting trigger logic.   [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5b8c409c109954ea520e5c1e6de9c1f0834889c2) 
+
+- ignore [view commit](http://github.com/pyr0ball/pyr0piezo/commit/0d73cc55ef50b1bd11193d47e42e2f0afad97601) 
+
+- Merge branch 'master' of https://github.com/pyr0ball/pyr0piezo [view commit](http://github.com/pyr0ball/pyr0piezo/commit/e0ebe53efcb320a8ba2d552461838486075b0d3b) 
+
+- Fix for gain adjustment  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/94e2c127951575f3847e72235969a1623eac13a4) 
+
+- Merge branch 'develop' of https://github.com/pyr0ball/pyr0piezo into develop [view commit](http://github.com/pyr0ball/pyr0piezo/commit/75776942085c672776ceaa32988dce46d45389a2) 
+
+- Merge pull request #63 from loredan/master [view commit](http://github.com/pyr0ball/pyr0piezo/commit/ecd472d80f0a7a46bc7a6d5eddbbe107c6ed22ed) 
+
+- Merge branch 'develop' of https://github.com/pyr0ball/pyr0piezo into develop [view commit](http://github.com/pyr0ball/pyr0piezo/commit/d30c60639c6a0f82697a97257e89b2291526aa0e) 
+
+- fixing serial input not taking effect immediately  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/4076423e1babf8e6e45f1878481dfe42f29fe211) 
+
+- fixed accidental reversal of gain adjust #oops [view commit](http://github.com/pyr0ball/pyr0piezo/commit/3dcadb5e4ee9449eafdcd9f9861ba8b142373eb1) 
+
+- Revert "fixed accidental reversal of gain adjust #oops" [view commit](http://github.com/pyr0ball/pyr0piezo/commit/2e4cf0ce58e460622cf5e639a15f78481c319839) 
+
+
+------------------------------------
+### v2.2.0 to v2.2.1
+
+Changelog updated 2020-01-16_11-24-38
+
+ *Added Features*
+
+- modified i2c registermap, added stubs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/44bd9f0182551668aaab3dc2de385f5a79deab13) 
+
+- added firmware version to serial response  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a3e4ec86a50ed991f97b5f85aabd0a15fd036d81) 
+
+- Changed default state of I2C input macro to enabled  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/217c13b82700d58774b874f0865f5ca04f3cc418) 
+
+- changed error LED behavor to instead indicate a trigger event  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a1267204d5403a3fcd20f680be75cc6753366ca9) 
+
+
+------------------------------------
+
+ *Bugfixes*
+
+- fixed platformio.ini to allow build and upload directly  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/79f0d657dae01ad02d266a6bccb526845505fa5f) 
+
+- fixed logic and pzdet inputs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/c30905bd74cbeee65109ae18643ec04123abecbd) 
+
+- fixed logic level change not taking effect til trigger  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a9d928833ae6d14214eb6c7c8d67bd5974ad9e74) 
+
+- changed compiler to include help message only on 328pb  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/49bfe7663be0cf019b0fa1aa846345dbcf57a6e5) 
+
+- fixed missing semicolon  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/568dc93311a8d3494a61e922cccb929b97420f75) 
+
+
+------------------------------------
+
+ *Documentation Updates*
+
+- Updated changelog  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/30999ed4a85cdaa3950d054585f2e8e1aa40b08a) 
+
+- added instructions for PZDET and LOGIC to main.cpp  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/e668988f3e19932119ac72bfea4e37bb68af4197) 
+
+- added docs for wiring up UART and uploading firmware  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/7d352360d959c2db4ea76a79ba3f1acb30223905) 
+
+- fixed typo in link to uart pdf  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5e82dc5cd52ab07667528740195c2beb0991256a) 
+
+- fixed another typo in docs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/85b63734d758edf3e3b1204091920ffe8ed0068f) 
+
+- Added wiring image for ezpz uart  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/882a8721f0f0c8cd4eefa72273038afe15239471) 
+
+
+------------------------------------
+
+ *Full Changelog*
+
+- Updated changelog  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/30999ed4a85cdaa3950d054585f2e8e1aa40b08a) 
+
+- fixed platformio.ini to allow build and upload directly  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/79f0d657dae01ad02d266a6bccb526845505fa5f) 
+
+- removed bad merge lines [view commit](http://github.com/pyr0ball/pyr0piezo/commit/d903a8a4f371f1ab5a2dbd87b2ae19bf4c0ac080) 
+
+- fixed logic and pzdet inputs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/c30905bd74cbeee65109ae18643ec04123abecbd) 
+
+- added instructions for PZDET and LOGIC to main.cpp  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/e668988f3e19932119ac72bfea4e37bb68af4197) 
+
+- fixed logic level change not taking effect til trigger  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a9d928833ae6d14214eb6c7c8d67bd5974ad9e74) 
+
+- changed compiler to include help message only on 328pb  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/49bfe7663be0cf019b0fa1aa846345dbcf57a6e5) 
+
+- fixed missing semicolon  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/568dc93311a8d3494a61e922cccb929b97420f75) 
+
+- added verbose output to PIO build flags [view commit](http://github.com/pyr0ball/pyr0piezo/commit/539e5d141125f04c009c2347d187fdfc84b5c451) 
+
+- modified i2c registermap, added stubs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/44bd9f0182551668aaab3dc2de385f5a79deab13) 
+
+- added docs for wiring up UART and uploading firmware  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/7d352360d959c2db4ea76a79ba3f1acb30223905) 
+
+- fixed typo in link to uart pdf  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5e82dc5cd52ab07667528740195c2beb0991256a) 
+
+- fixed another typo in docs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/85b63734d758edf3e3b1204091920ffe8ed0068f) 
+
+- Added wiring image for ezpz uart  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/882a8721f0f0c8cd4eefa72273038afe15239471) 
+
+- added firmware version to serial response  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a3e4ec86a50ed991f97b5f85aabd0a15fd036d81) 
+
+- changed default state for i2c input macro to enabled  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/904d6af9dc3e74aeae190cde418338f80e906e84) 
+
+- Changed default state of I2C input macro to enabled  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/217c13b82700d58774b874f0865f5ca04f3cc418) 
+
+- changed error LED behavor to instead indicate a trigger event  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a1267204d5403a3fcd20f680be75cc6753366ca9) 
+
+
 ------------------------------------
diff --git a/docs/changelogs/changelog_2019-12-28_v2.1.5_v2.1.6.md b/docs/changelogs/changelog_2019-12-28_v2.1.5_v2.1.6.md
new file mode 100644
index 0000000..771e628
--- /dev/null
+++ b/docs/changelogs/changelog_2019-12-28_v2.1.5_v2.1.6.md
@@ -0,0 +1,71 @@
+###Pyr0-Piezo Changelog v2.1.5 to v2.1.6
+
+#### Added Features
+
+- Adds support for inverting trigger logic.   [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5b8c409c109954ea520e5c1e6de9c1f0834889c2) 
+
+
+------------------------------------
+
+#### Bugfixes
+
+- Fixed width of thermals on singledisk adapter  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/024c6f79111242985d1ce0a0b3ad4358f0d885bf) 
+
+- Fixed pad thermals, added url, fixed logo  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/041836b40b0e0d6fce617c9f73365e8ca9ecb076) 
+
+- Fix for gain adjustment  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/94e2c127951575f3847e72235969a1623eac13a4) 
+
+- fixing serial input not taking effect immediately  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/4076423e1babf8e6e45f1878481dfe42f29fe211) 
+
+
+------------------------------------
+
+#### Documentation Updates
+
+- Documentation update for v2.1.5  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5d72861a36e1e76c1264d3bc8b02479edc6d3979) 
+
+
+------------------------------------
+
+#### Full Changelog
+
+- Documentation update for v2.1.5  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5d72861a36e1e76c1264d3bc8b02479edc6d3979) 
+
+- These code changes are for resetting the config values to the default values by issuing the ERASE word via a serial terminal. [view commit](http://github.com/pyr0ball/pyr0piezo/commit/106e6c85c3c5f97e20d947a8b6ea3a6f8f30a268) 
+
+- Merge pull request #60 from klcjr89/master [view commit](http://github.com/pyr0ball/pyr0piezo/commit/9ae410f011c43e5bf4ccb902ef1734d0a61edb28) 
+
+- Fixed width of thermals on singledisk adapter  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/024c6f79111242985d1ce0a0b3ad4358f0d885bf) 
+
+- Fixed pad thermals, added url, fixed logo  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/041836b40b0e0d6fce617c9f73365e8ca9ecb076) 
+
+- Merge branch 'master' of https://github.com/pyr0ball/pyr0piezo [view commit](http://github.com/pyr0ball/pyr0piezo/commit/cd3503beb31c346c0f0f1a1cc53c6ba1a06c57a3) 
+
+- Merge branch 'master' of https://github.com/pyr0ball/pyr0piezo into develop [view commit](http://github.com/pyr0ball/pyr0piezo/commit/64550544467b6e2e5627938338ac63c5a39c5b9b) 
+
+- removed file that shouldn't be tracked [view commit](http://github.com/pyr0ball/pyr0piezo/commit/4f3558b79198da40932a678d410cca57b1e0d801) 
+
+- slight edit to platformio.ini, added dependencies [view commit](http://github.com/pyr0ball/pyr0piezo/commit/bc2de746b469d2f04452b55baafd523cc7e335da) 
+
+- Merge branch 'master' of https://github.com/pyr0ball/pyr0piezo into develop [view commit](http://github.com/pyr0ball/pyr0piezo/commit/407c9834d1c8e9db58041ba84cbe5064d64e20d8) 
+
+- Adds support for inverting trigger logic.   [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5b8c409c109954ea520e5c1e6de9c1f0834889c2) 
+
+- ignore [view commit](http://github.com/pyr0ball/pyr0piezo/commit/0d73cc55ef50b1bd11193d47e42e2f0afad97601) 
+
+- Merge branch 'master' of https://github.com/pyr0ball/pyr0piezo [view commit](http://github.com/pyr0ball/pyr0piezo/commit/e0ebe53efcb320a8ba2d552461838486075b0d3b) 
+
+- Fix for gain adjustment  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/94e2c127951575f3847e72235969a1623eac13a4) 
+
+- Merge branch 'develop' of https://github.com/pyr0ball/pyr0piezo into develop [view commit](http://github.com/pyr0ball/pyr0piezo/commit/75776942085c672776ceaa32988dce46d45389a2) 
+
+- Merge pull request #63 from loredan/master [view commit](http://github.com/pyr0ball/pyr0piezo/commit/ecd472d80f0a7a46bc7a6d5eddbbe107c6ed22ed) 
+
+- Merge branch 'develop' of https://github.com/pyr0ball/pyr0piezo into develop [view commit](http://github.com/pyr0ball/pyr0piezo/commit/d30c60639c6a0f82697a97257e89b2291526aa0e) 
+
+- fixing serial input not taking effect immediately  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/4076423e1babf8e6e45f1878481dfe42f29fe211) 
+
+- fixed accidental reversal of gain adjust #oops [view commit](http://github.com/pyr0ball/pyr0piezo/commit/3dcadb5e4ee9449eafdcd9f9861ba8b142373eb1) 
+
+- Revert "fixed accidental reversal of gain adjust #oops" [view commit](http://github.com/pyr0ball/pyr0piezo/commit/2e4cf0ce58e460622cf5e639a15f78481c319839) 
+
diff --git a/docs/changelogs/changelog_2020-01-16_v2.2.0_v2.2.1.md b/docs/changelogs/changelog_2020-01-16_v2.2.0_v2.2.1.md
new file mode 100644
index 0000000..705654a
--- /dev/null
+++ b/docs/changelogs/changelog_2020-01-16_v2.2.0_v2.2.1.md
@@ -0,0 +1,87 @@
+###Pyr0-Piezo Changelog beta-avr-v2.2.0 to beta-avr-v2.2.1
+
+#### Added Features
+
+- modified i2c registermap, added stubs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/44bd9f0182551668aaab3dc2de385f5a79deab13) 
+
+- added firmware version to serial response  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a3e4ec86a50ed991f97b5f85aabd0a15fd036d81) 
+
+- changed default state for i2c input macro to enabled  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/904d6af9dc3e74aeae190cde418338f80e906e84) 
+
+- Changed default state of I2C input macro to enabled  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/217c13b82700d58774b874f0865f5ca04f3cc418) 
+
+- changed error LED behavor to instead indicate a trigger event  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a1267204d5403a3fcd20f680be75cc6753366ca9) 
+
+
+------------------------------------
+
+#### Bugfixes
+
+- fixed platformio.ini to allow build and upload directly  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/79f0d657dae01ad02d266a6bccb526845505fa5f) 
+
+- fixed logic and pzdet inputs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/c30905bd74cbeee65109ae18643ec04123abecbd) 
+
+- fixed logic level change not taking effect til trigger  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a9d928833ae6d14214eb6c7c8d67bd5974ad9e74) 
+
+- changed compiler to include help message only on 328pb  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/49bfe7663be0cf019b0fa1aa846345dbcf57a6e5) 
+
+- fixed missing semicolon  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/568dc93311a8d3494a61e922cccb929b97420f75) 
+
+
+------------------------------------
+
+#### Documentation Updates
+
+- Updated changelog  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/30999ed4a85cdaa3950d054585f2e8e1aa40b08a) 
+
+- added instructions for PZDET and LOGIC to main.cpp  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/e668988f3e19932119ac72bfea4e37bb68af4197) 
+
+- added docs for wiring up UART and uploading firmware  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/7d352360d959c2db4ea76a79ba3f1acb30223905) 
+
+- fixed typo in link to uart pdf  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5e82dc5cd52ab07667528740195c2beb0991256a) 
+
+- fixed another typo in docs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/85b63734d758edf3e3b1204091920ffe8ed0068f) 
+
+- Added wiring image for ezpz uart  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/882a8721f0f0c8cd4eefa72273038afe15239471) 
+
+
+------------------------------------
+
+#### Full Changelog
+
+- Updated changelog  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/30999ed4a85cdaa3950d054585f2e8e1aa40b08a) 
+
+- fixed platformio.ini to allow build and upload directly  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/79f0d657dae01ad02d266a6bccb526845505fa5f) 
+
+- removed bad merge lines [view commit](http://github.com/pyr0ball/pyr0piezo/commit/d903a8a4f371f1ab5a2dbd87b2ae19bf4c0ac080) 
+
+- fixed logic and pzdet inputs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/c30905bd74cbeee65109ae18643ec04123abecbd) 
+
+- added instructions for PZDET and LOGIC to main.cpp  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/e668988f3e19932119ac72bfea4e37bb68af4197) 
+
+- fixed logic level change not taking effect til trigger  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a9d928833ae6d14214eb6c7c8d67bd5974ad9e74) 
+
+- changed compiler to include help message only on 328pb  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/49bfe7663be0cf019b0fa1aa846345dbcf57a6e5) 
+
+- fixed missing semicolon  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/568dc93311a8d3494a61e922cccb929b97420f75) 
+
+- added verbose output to PIO build flags [view commit](http://github.com/pyr0ball/pyr0piezo/commit/539e5d141125f04c009c2347d187fdfc84b5c451) 
+
+- modified i2c registermap, added stubs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/44bd9f0182551668aaab3dc2de385f5a79deab13) 
+
+- added docs for wiring up UART and uploading firmware  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/7d352360d959c2db4ea76a79ba3f1acb30223905) 
+
+- fixed typo in link to uart pdf  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/5e82dc5cd52ab07667528740195c2beb0991256a) 
+
+- fixed another typo in docs  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/85b63734d758edf3e3b1204091920ffe8ed0068f) 
+
+- Added wiring image for ezpz uart  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/882a8721f0f0c8cd4eefa72273038afe15239471) 
+
+- added firmware version to serial response  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a3e4ec86a50ed991f97b5f85aabd0a15fd036d81) 
+
+- changed default state for i2c input macro to enabled  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/904d6af9dc3e74aeae190cde418338f80e906e84) 
+
+- Changed default state of I2C input macro to enabled  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/217c13b82700d58774b874f0865f5ca04f3cc418) 
+
+- changed error LED behavor to instead indicate a trigger event  [view commit](http://github.com/pyr0ball/pyr0piezo/commit/a1267204d5403a3fcd20f680be75cc6753366ca9) 
+
diff --git a/docs/schematics/other/USB-UART-Wiring-Example.pdf b/docs/schematics/other/USB-UART-Wiring-Example.pdf
new file mode 100644
index 0000000..737afae
Binary files /dev/null and b/docs/schematics/other/USB-UART-Wiring-Example.pdf differ
diff --git a/docs/schematics/other/uart-programmer-wiring.md b/docs/schematics/other/uart-programmer-wiring.md
new file mode 100644
index 0000000..5521587
--- /dev/null
+++ b/docs/schematics/other/uart-programmer-wiring.md
@@ -0,0 +1,7 @@
+![](../../../assets/images/board-images/easy-piezi/pp-v2.1.2-uart-wiring.png)
+
+<object data="../../other/USB-UART-Wiring-Example.pdf" type="application/pdf" width="100%" height="450px">
+    <embed src="../../other/USB-UART-Wiring-Example.pdf">
+        <p>This browser does not support PDFs. Please download the PDF to view it: <a href="../../other/USB-UART-Wiring-Example.pdf">Download PDF</a>.</p>
+    </embed>
+</object>
\ No newline at end of file
diff --git a/docs/tutorials/firmware-update/beta-unit-firmware-update.md b/docs/tutorials/firmware-update/beta-unit-firmware-update.md
new file mode 100644
index 0000000..03d602c
--- /dev/null
+++ b/docs/tutorials/firmware-update/beta-unit-firmware-update.md
@@ -0,0 +1,65 @@
+# Pyr0-piezo Beta Unit Firmware Update
+
+The firmware for this project can be updated using one of three methods, VS Code, Arduino IDE, or avrdude.
+
+Please be sure you've already [wired up your sensor's UART port](../../schematics/other/uart-programmer-wiring.md)
+
+## VS Code (Preferred Application)
+
+### Installing dependencies
+
+1. Install [VS Code from Micosoft's official page](https://code.visualstudio.com/download)
+2. Use the "Extensions" menu to install PlatformIO.
+3. (Optional) Install extra plugins to assist in development:
+    - GitLense
+    - markdownlint
+    - Markdown Preview Enhanced
+    - C/C++
+    - C++ Intellisense
+
+### Configuration
+
+1. In PIO Home, open the firmware folder:
+    - `~/pyr0piezo/firmware/AVR-Source/Pyr0_Piezo_sensor_v2.x.x`
+2. Make certain you're on the latest `develop` branch
+    - In GitLense, under the "Repositories" menu, expand the "Branches" menu
+    - Right click on `develop` and select "Switch to Branch"
+    - Back at the top of the "Repositories" menu, hover the mouse over `Pyr0_Piezo_Sensor_v2.x.x` and click first on `fetch`, then on `pull`
+
+### Upload
+
+1. Make any desired adjustments to default values in `src/pP_config.h`
+2. Click the "PlatformIO: Upload" button found in the bottom bar of the VS Code window
+3. Verify Serial connection by opening the Serial Monitor and typing `CONFIG` or `STATE`. You should get a response.
+
+## Arduino IDE
+
+1. Install [Arduino IDE from Arduino's official page](https://www.arduino.cc/en/main/software)
+2. Under File > Preferences > Additional Board Manager URL's, Add:
+    - `https://mcudude.github.io/MiniCore/package_MCUdude_MiniCore_index.json`
+
+## avrdude
+
+#### Windows
+
+1. Install a bash-like terminal. Choose from a number of options:
+    - [Windows Subsystem for Linux]
+    - [CygWin]
+    - [Mingw64]
+    - [Git Bash (Comes bundled with git)]
+2. Download the [avrdude binaries]
+3. Extract the binaries somewhere your terminal can find them
+
+#### Linux
+
+##### Ubuntu/Debian Distro's
+
+```bash
+sudo apt update && sudo apt install -y avrdude
+```
+
+##### Fedora/RHEL/CentOS Distros
+
+```bash
+sudo yum install -y avrdude
+```
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/platformio.ini b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/platformio.ini
index 715165e..a77335c 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/platformio.ini
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/platformio.ini
@@ -11,12 +11,31 @@
 [platformio]
 default_envs = ATmega328PB
 
+[env:ICSP_Bootloader]
+platform = atmelavr
+framework = arduino
+upload_protocol = stk500v1
+; each flag in a new line
+upload_flags =
+    -P$UPLOAD_PORT
+    -b$UPLOAD_SPEED
+
+board_build.f_cpu = 8000000L
+board_hardware.oscillator = internal
+board_hardware.uart = uart0
+board_hardware.bod = 1.8v
+board_hardware.eesave = yes
+
 [env:ATmega88P]
 platform = atmelavr
 board = ATmega88P
 framework = arduino
 lib_deps = Arduino
-upload_protocol = stk500v1
+
+build_flags = !python version_git.py
+;    --verbose
+
+upload_protocol = arduino
 ; each flag in a new line
 upload_flags =
     -P$UPLOAD_PORT
@@ -28,24 +47,31 @@ upload_flags =
 upload_speed = 38400
 
 board_build.f_cpu = 8000000L
-board_fuses.lfuse = "0xE2"
-board_fuses.hfuse = "0xDF"
-board_fuses.efuse = "0xF9"
+board_hardware.oscillator = internal
+board_hardware.uart = uart0
+board_hardware.bod = 1.8v
+board_hardware.eesave = yes
 
 [env:ATmega328PB]
 platform = atmelavr
 board = ATmega328PB
 framework = arduino
 lib_deps = Arduino
-upload_protocol = stk500v1
+
+build_flags = !python version_git.py
+;    --verbose
+
+upload_protocol = arduino
 ; each flag in a new line
 upload_flags =
     -P$UPLOAD_PORT
     -b$UPLOAD_SPEED
-    -fmax_errors=5
 
 ; edit these lines
-;upload_port = COM4
 upload_speed = 38400
 
-board_build.f_cpu = 8000000L
\ No newline at end of file
+board_build.f_cpu = 8000000L
+board_hardware.oscillator = internal
+board_hardware.uart = uart0
+board_hardware.bod = 1.8v
+board_hardware.eesave = yes
\ No newline at end of file
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp
index 26bddca..6eae9d1 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/Pyr0_Piezo_Sensor_V2.x.x.cpp
@@ -34,7 +34,9 @@ To set the below parameters using serial input, use the following:
 
 To change trigger active duration: TRG_D [integer for milliseconds]
 To change gain factor: GAIN_F [integer for gain state - see note*]
-To change ADC hysteresis value: HYST [integer]
+To change the output logic: LOGIC [0|1] (0 for active low, 1 for active high)
+To enable piezo plugged detection: PZDET [0|1] (0 for disabled, 1 for enabled)
+To change ADC hysteresis value: HYST [integer in millivolts]
 To change sensor input pullup vRef low threshold: VFOL [integer in millivolts]
 To change comparator trigger high threshold: VCOMP [integer in millivolts]
 To change the duration between ADC measurements: LOOP_D [integer in milliseconds]
@@ -45,7 +47,7 @@ You can also enable or disable DEBUG output with: DEBUG [0|1]
 You can query the current configuration with: CONFIG
 You can query the current state (including ADC measurements) with: STATE
 
-To reset all settings to defaults, use: RESET
+To set all settings to defaults, use: ERASE
 
 These commands should be wrapped in this format:
 CMD INT
@@ -97,7 +99,7 @@ update the voltMeterConstant variable in pP_config.h with the correct value
 #include "pP_serial.h"
 
 // i2c input toggle. Uncomment to enable
-//#define I2C_INPUT true
+#define I2C_INPUT
 
 void setup() {
   //Setup PWM on voltage follower (PD3)
@@ -112,6 +114,7 @@ void setup() {
 
   pinMode(TRG_OUT, OUTPUT);       // declare the Trigger as as OUTPUT
   pinMode(ERR_LED, OUTPUT);
+  pinMode(PZDET_PIN, INPUT_PULLUP);
   pinMode(Z_TRG, INPUT_PULLUP);   // declare z-sense input with pullup
   pinMode(V_FOLLOW_PIN, INPUT);
   pinMode(VCOMP_SENSE_PIN, INPUT);
@@ -128,6 +131,8 @@ void setup() {
   restoreConfig();
 
   adjustGain();
+
+  digitalWriteFast(TRG_OUT, !LOGIC);
 }
 
 /*------------------------------------------------*/
@@ -139,7 +144,7 @@ void loop() {
     if (BlinkCount > 0) {
       BlinkState = !BlinkState;
       digitalWriteFast(ERR_LED, BlinkState);
-      digitalWriteFast(TRG_OUT, BlinkState);
+      //digitalWriteFast(TRG_OUT, BlinkState);
       --BlinkCount;
     }
 
@@ -171,15 +176,20 @@ void loop() {
       ERR_STATE = 0;
     }
 
+    // Check that the piezo disk is properly connected
+    pzConCheck();
+
     // Blink LED's on init
     if (BlinkCount > 0) {
       BlinkState = !BlinkState;
       digitalWriteFast(ERR_LED, BlinkState);
-      digitalWriteFast(TRG_OUT, BlinkState);
+//      digitalWriteFast(TRG_OUT, BlinkState);
       --BlinkCount;
-    } else {
+//    } else {
       // Check for error state
-      checkError();
+//      checkError();
+    } else {
+      digitalWriteFast(ERR_LED, 0);
     }
 
     // Print state if debug is on
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.cpp b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.cpp
index 4c38f21..7c74583 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.cpp
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.cpp
@@ -7,90 +7,8 @@ int compThrs = COMP_THRESHOLD_DEFAULT;
 int LOOP_DUR = LOOP_DUR_DEFAULT; // duration of time between ADC checks and other loop functions
 int TRG_DUR = TRG_DUR_DEFAULT;   // duration of the Z-axis pulse sent, in ms
 int Hyst = HYST_DEFAULT;         // Hysteresis value for ADC measurements
+int LOGIC = LOGIC_DEFAULT;      // Trigger output logic (active low or active high)
+int PZDET = PZDET_DEFAULT;      // Enable/disable piezo connection detection
 int Debug = 0;
 long voltMeterConstant = VM_CONST_DEFAULT;
 uint8_t pP_i2c_address = 0xa0;
-
-void resetEEPROM() {
-	
-	resetConfig();
-	
-    EEPROM.put(GAIN_FACTOR_ADDRESS, GAIN_FACTOR);
-    EEPROM.put(FOLLOWER_THRESHOLD_ADDRESS, followerThrs);
-    EEPROM.put(COMP_THRESHOLD_ADDRESS, compThrs);
-    EEPROM.put(LOOP_DUR_ADDRESS, LOOP_DUR);
-    EEPROM.put(TRG_DUR_ADDRESS, TRG_DUR);
-    EEPROM.put(HYST_ADDRESS, Hyst);
-    EEPROM.put(VM_CONST_ADDRESS, voltMeterConstant);
-}
-
-// Restore config from EEPROM, otherwise reset config and write to EEPROM
-void restoreConfig() {
-    int temp;
-	
-	bool reset = false;
-
-    EEPROM.get(GAIN_FACTOR_ADDRESS, temp);
-    if (temp < 0 || temp > 4) {
-		reset = true;
-    } else {
-        GAIN_FACTOR = temp;
-    }
-
-    EEPROM.get(FOLLOWER_THRESHOLD_ADDRESS, temp);
-    if (temp < 0 || temp > 5000) {
-        reset = true;
-    } else {
-        followerThrs = temp;
-    }
-
-    EEPROM.get(COMP_THRESHOLD_ADDRESS, temp);
-    if (temp < 0 || temp > 5000) {
-        reset = true;
-    } else {
-        compThrs = temp;
-    }
-
-    EEPROM.get(LOOP_DUR_ADDRESS, temp);
-    if (temp < 0 && temp > 1000) {
-        reset = true;
-    } else {
-        LOOP_DUR = temp;
-    }
-
-    EEPROM.get(TRG_DUR_ADDRESS, temp);
-    if (temp < 0 || temp > 1000) {
-        reset = true;
-    } else {
-        TRG_DUR = temp;
-    }
-
-    EEPROM.get(HYST_ADDRESS, temp);
-    if (temp < 0 || temp > 1000) {
-        reset = true;
-    } else {
-        Hyst = temp;
-    }
-
-    long longTemp;
-    EEPROM.get(VM_CONST_ADDRESS, longTemp);
-    if (longTemp < 1000000L || longTemp > 1200000L) {
-        reset = true;
-    } else {
-        voltMeterConstant = longTemp;
-    }
-	
-	if (reset) {
-		resetEEPROM();
-	}
-}
-
-void resetConfig() {
-    GAIN_FACTOR = GAIN_FACTOR_DEFAULT;
-    followerThrs = FOLLOWER_THRESHOLD_DEFAULT;
-    compThrs = COMP_THRESHOLD_DEFAULT;
-    LOOP_DUR = LOOP_DUR_DEFAULT;
-    TRG_DUR = TRG_DUR_DEFAULT;
-    Hyst = HYST_DEFAULT;
-    voltMeterConstant = VM_CONST_DEFAULT;
-}
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.h
index b5d57f1..abe8a97 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_config.h
@@ -43,8 +43,20 @@
   extern int Hyst; // Hysteresis value for ADC measurements
 #endif
 
+#define LOGIC_DEFAULT 1
+#define LOGIC_ADDRESS 32
+#if !(defined(LOGIC))
+  extern int LOGIC; // Trigger logic scheme, Active LOW is default
+#endif
+
+#define PZDET_DEFAULT 0
+#define PZDET_ADDRESS 26
+#if !(defined(PZDET))
+  extern int PZDET; // Enable or disable piezo connection detection, default is off
+#endif
+
 #if !(defined(Debug))
- extern int Debug;
+  extern int Debug;
 #endif
 
 #define VM_CONST_ADDRESS 28
@@ -58,10 +70,10 @@
   #if !(defined(pP_i2c_address))
     extern uint8_t pP_i2c_address;     // I2C Bus Address
   #endif
-#endif
+#endif // I2C_INPUT
 
-void resetEEPROM();
-void resetConfig();
+void eraseEEPROM();
+void setDefaultConfig();
 void restoreConfig();
 
-#endif
+#endif // PP_CONFIG_H
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h
index 4395428..d721f33 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h
@@ -3,6 +3,9 @@
   Created by Alan "pyr0ball" Weinstock 6/26/2019
 */
 
+//#pragma once
+//#include "pP_function.h"
+
 void digitalWriteFast(uint8_t pin, uint8_t x) {
   if (pin / 8) { // pin >= 8
     PORTB ^= (-x ^ PORTB) & (1 << (pin % 8));
@@ -22,12 +25,19 @@ int inline analogReadFast(byte ADCpin)
 
 /*------------------------------------------------*/
 
+void doubleFlash() {
+    BlinkCount = 4 ;
+}
+
+/*------------------------------------------------*/
+
 void pulse() {
-  digitalWriteFast(TRG_OUT, LOW);
+  digitalWriteFast(TRG_OUT, LOGIC);
   sensorHReading = 1;
   delay(TRG_DUR);
-  digitalWriteFast(TRG_OUT, HIGH);
+  digitalWriteFast(TRG_OUT, !LOGIC);
   Serial.println("Trig'd!");
+  doubleFlash();
 }
 
 /*------------------------------------------------*/
@@ -95,6 +105,9 @@ update the voltMeterConstant variable in pP_config.h with the correct value
   /* Compares diffs of threshold vs read value
    if positive, adjusts the follower to within
    the range set above*/
+  followerLong = followerThrs * 1023L;
+  followerInt = (long long) followerLong / Vin;
+  followerInt = (int) followerInt;
   ADJ_FOLLOW = (followerInt / 4);
 
   // Analog output (PWM) of duty cycle
@@ -104,6 +117,9 @@ update the voltMeterConstant variable in pP_config.h with the correct value
 /*------------------------------------------------*/
 
 void adjustComp() {
+  compLong = compThrs * 1023L;
+  compInt = (long long) compLong / Vin;
+  compInt = (int) compInt;
   OCR1A = compInt;
 }
 
@@ -119,46 +135,167 @@ void calibrateAlert() {
 /*------------------------------------------------*/
 
 void adjustGain() {
-
-  if (GAIN_FACTOR == 0) {
-    pinMode(GADJ_R3, INPUT);
-    pinMode(GADJ_R2, INPUT);
+  switch (GAIN_FACTOR)
+  {
+  case 4:
+    pinMode(GADJ_R0, OUTPUT);
+    digitalWriteFast(GADJ_R0, LOW);
+    break;
+  case 3:
+    pinMode(GADJ_R1, OUTPUT);
+    digitalWriteFast(GADJ_R1, LOW);
+    pinMode(GADJ_R0, INPUT);
+    break;
+  case 2:
+    pinMode(GADJ_R2, OUTPUT);
+    digitalWriteFast(GADJ_R2, LOW);
     pinMode(GADJ_R1, INPUT);
     pinMode(GADJ_R0, INPUT);
-  }
-  else if (GAIN_FACTOR > 0) {
+    break;
+  case 1:
     pinMode(GADJ_R3, OUTPUT);
     digitalWriteFast(GADJ_R3, LOW);
     pinMode(GADJ_R2, INPUT);
     pinMode(GADJ_R1, INPUT);
     pinMode(GADJ_R0, INPUT);
-  }
-  else if (GAIN_FACTOR > 1) {
-    pinMode(GADJ_R2, OUTPUT);
-    digitalWriteFast(GADJ_R2, LOW);
+    break;
+  case 0:
+  default:
+    pinMode(GADJ_R3, INPUT);
+    pinMode(GADJ_R2, INPUT);
     pinMode(GADJ_R1, INPUT);
     pinMode(GADJ_R0, INPUT);
-  }
-  else if (GAIN_FACTOR > 2) {
-    pinMode(GADJ_R1, OUTPUT);
-    digitalWriteFast(GADJ_R1, LOW);
-    pinMode(GADJ_R0, INPUT);
-  }
-  else if (GAIN_FACTOR > 3) {
-    pinMode(GADJ_R0, OUTPUT);
-    digitalWriteFast(GADJ_R0, LOW);
+    break;
   }
 }
 
 /*------------------------------------------------*/
 
-void checkError () {
-  if (ERR_STATE == 1) {
-    digitalWriteFast(ERR_LED, BlinkState);
-    BlinkState = !BlinkState;
-  }
-  else if (ERR_STATE == 0) {
-    BlinkState = LOW;
-    digitalWriteFast(ERR_LED, BlinkState);
+//void checkError () {
+//  if (ERR_STATE == 1) {
+//    digitalWriteFast(ERR_LED, BlinkState);
+//    BlinkState = !BlinkState;
+//  }
+//  else if (ERR_STATE == 0) {
+//    BlinkState = LOW;
+//    digitalWriteFast(ERR_LED, BlinkState);
+//  }
+//}
+
+/*------------------------------------------------*/
+
+void pzConCheck () {
+  PZ_STATE = digitalRead(PZDET_PIN);
+  if (PZ_STATE == PZDET) {
+    //digitalWriteFast(TRG_OUT, LOGIC);
+    ERR_STATE = 1;
   }
 }
+
+/*------------------------------------------------*/
+void eraseEEPROM() {
+	
+	setDefaultConfig();
+	
+    EEPROM.put(GAIN_FACTOR_ADDRESS, GAIN_FACTOR);
+    EEPROM.put(FOLLOWER_THRESHOLD_ADDRESS, followerThrs);
+    EEPROM.put(COMP_THRESHOLD_ADDRESS, compThrs);
+    EEPROM.put(LOOP_DUR_ADDRESS, LOOP_DUR);
+    EEPROM.put(TRG_DUR_ADDRESS, TRG_DUR);
+    EEPROM.put(HYST_ADDRESS, Hyst);
+    EEPROM.put(PZDET_ADDRESS, PZDET);
+    EEPROM.put(LOGIC_ADDRESS, LOGIC);
+    EEPROM.put(VM_CONST_ADDRESS, voltMeterConstant);
+}
+
+// Restore config from EEPROM, otherwise erase config and write to EEPROM
+void restoreConfig() {
+    int temp;
+	
+	bool erase = false;
+
+    EEPROM.get(GAIN_FACTOR_ADDRESS, temp);
+    if (temp < 0 || temp > 4) {
+		erase = true;
+    } else {
+        GAIN_FACTOR = temp;
+    }
+
+    EEPROM.get(FOLLOWER_THRESHOLD_ADDRESS, temp);
+    if (temp < 0 || temp > 5000) {
+        erase = true;
+    } else {
+        followerThrs = temp;
+    }
+
+    EEPROM.get(COMP_THRESHOLD_ADDRESS, temp);
+    if (temp < 0 || temp > 5000) {
+        erase = true;
+    } else {
+        compThrs = temp;
+    }
+
+    EEPROM.get(LOOP_DUR_ADDRESS, temp);
+    if (temp < 0 && temp > 1000) {
+        erase = true;
+    } else {
+        LOOP_DUR = temp;
+    }
+
+    EEPROM.get(TRG_DUR_ADDRESS, temp);
+    if (temp < 0 || temp > 1000) {
+        erase = true;
+    } else {
+        TRG_DUR = temp;
+    }
+
+    EEPROM.get(HYST_ADDRESS, temp);
+    if (temp < 0 || temp > 1000) {
+        erase = true;
+    } else {
+        Hyst = temp;
+    }
+
+    EEPROM.get(PZDET_ADDRESS, temp);
+    if (temp < 0 || temp > 1) {
+        erase = true;
+    } else {
+        PZDET = temp;
+    }
+
+    EEPROM.get(LOGIC_ADDRESS, temp);
+    if (temp < 0 || temp > 1) {
+        erase = true;
+    } else {
+        LOGIC = temp;
+    }
+
+    long longTemp;
+    EEPROM.get(VM_CONST_ADDRESS, longTemp);
+    if (longTemp < 1000000L || longTemp > 1200000L) {
+        erase = true;
+    } else {
+        voltMeterConstant = longTemp;
+    }
+	
+	if (erase) {
+		eraseEEPROM();
+	}
+
+    adjustFollow();
+    adjustComp();
+}
+
+void setDefaultConfig() {
+    GAIN_FACTOR = GAIN_FACTOR_DEFAULT;
+    followerThrs = FOLLOWER_THRESHOLD_DEFAULT;
+    compThrs = COMP_THRESHOLD_DEFAULT;
+    LOOP_DUR = LOOP_DUR_DEFAULT;
+    TRG_DUR = TRG_DUR_DEFAULT;
+    Hyst = HYST_DEFAULT;
+    PZDET = PZDET_DEFAULT;
+    LOGIC = LOGIC_DEFAULT;
+    voltMeterConstant = VM_CONST_DEFAULT;
+    adjustFollow();
+    adjustComp();
+}
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_i2c.cpp b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_i2c.cpp
index 057449d..fc23912 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_i2c.cpp
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_i2c.cpp
@@ -5,23 +5,59 @@
 #include "pP_i2c.h"
 #include <Wire.h>
 
+byte registerMap[regMapSize];
+byte registerMapTemp[regMapSize - 1];
+byte receivedCommands[maxBytes];
+
 pP_i2c::pP_i2c(){
 
 }
 
 void pP_i2c::init() {
   Wire.begin(pP_i2c_address);
+  Wire.onRequest(i2cReply);
+  Wire.onReceive(i2cInput);
+}
+
+void pP_i2c::i2cReportStatus() {
+  _i2cResponse = "{"
+}
+
+void pP_i2c::i2cReportVersion() {
+
+}
+
+void pP_i2c::i2cReportConfig() {
+
+}
+
+void pP_i2c::i2cReportIdentity() {
+
+}
+
+void pP_i2c::i2cRequestInput() {
+
+}
+
+void pP_i2c::i2cReply() {
+  Wire.send()
 }
 
 void pP_i2c::i2cInput(int bytesReceived) {
   for (int a = 0; a < bytesReceived; a++) {
-    if (a < maxBytes) {
-      cmdRcvd[a] = Wire.read();
+    // Check length of message, drops anything longer than [longBytes]
+    if (a <= maxBytes) {
+      cmdRcvd[a] = Wire.receive();
+    }
+    elif (a <= longBytes) {
+      longRcvd[a] = Wire.receive();
     }
     else {
-      longRcvd[a] = Wire.read();
+      Wire.receive(); //
     }
   }
+
+  // Check input command corresponds with register map, set 0x00 if not
   if (bytesReceived == 1 && (cmdRcvd[0] < regMapSize)) {
     return;
   }
@@ -29,35 +65,65 @@ void pP_i2c::i2cInput(int bytesReceived) {
     cmdRcvd[0] = 0x00;
     return;
   }
+
+  // Parse commands and apply changes or actions
   switch (cmdRcvd[0]) {
     case 0x00:
-      followerInt = (long) cmdRcvd[1];
+      i2cReportStatus();
       return;
       break;
     case 0x01:
-      compInt = (long) cmdRcvd[1];
+      followerInt = (int) cmdRcvd[1];
       return;
       break;
     case 0x02:
-      GAIN_FACTOR = (uint8_t) cmdRcvd[1];
+      compInt = (int) cmdRcvd[1];
       return;
       break;
     case 0x03:
-      Hyst = (uint8_t) cmdRcvd[1];
+      GAIN_FACTOR = (int) cmdRcvd[1];
       return;
       break;
     case 0x04:
-      LOOP_DUR = (uint8_t) cmdRcvd[1];
+      Hyst = (int) cmdRcvd[1];
       return;
       break;
     case 0x05:
-      TRG_DUR = (uint8_t) cmdRcvd[1];
+      LOOP_DUR = (int) cmdRcvd[1];
       return;
       break;
     case 0x06:
+      LOGIC = (int) cmdRcvd[1];
+      return;
+      break;
+    case 0x07:
+      PZDET = (int) cmdRcvd[1];
+      return;
+      break;
+    case 0x08:
+      TRG_DUR = (int) cmdRcvd[1];
+      return;
+      break;
+    case 0x09:
+      DEBUG = (int) cmdRcvd[1];
+      return;
+      break;
+    case 0x0a:
       voltMeterConstant = longRcvd[0]*65536+longRcvd[1]*256+longRcvd[2];
       return;
       break;
+    case 0x0b:
+      reportVersion();
+      return;
+      break;
+    case 0x0c:
+      reportConfig();
+      return;
+      break;
+    case 0x0d:
+      reportIdentity();
+      return;
+      break;
     default:
       return;
   }
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_i2c.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_i2c.h
index 6e49724..a21df47 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_i2c.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_i2c.h
@@ -2,18 +2,24 @@
 #define _pP_i2c_h_
 #ifdef I2C_INPUT
 
-
-#define senseInt_Offset 0x00 // Integer of sense threshold in millivolts
-#define compInt_Offset  0x01 // Integer of comparator threshold in millivolts
-#define gainFactor_Offset 0x02  // Gain adjustment factor. 0=3x, 1=3.5x, 2=4.33x, 3=6x, 4=11x
-#define hysteresis_Offset 0x03  // Hysteresis value for ADC measurements
-#define loopDuration_Offset 0x04  // duration of time between ADC checks and other loop functions
-#define triggerDuration_Offset  0x05 // duration of the Z-axis pulse sent, in ms
-#define voltMeterLong_Offset 0x06  // For fine-tuning the input volt master
+#define status_Offset 0x00 // Status register
+#define senseInt_Offset 0x01 // Integer of sense threshold in millivolts
+#define compInt_Offset  0x02 // Integer of comparator threshold in millivolts
+#define gainFactor_Offset 0x03  // Gain adjustment factor. 0=3x, 1=3.5x, 2=4.33x, 3=6x, 4=11x
+#define hysteresis_Offset 0x04  // Hysteresis value for ADC measurements
+#define loopDuration_Offset 0x05  // duration of time between ADC checks and other loop functions
+#define logicLevel_Offset 0x06
+#define piezoDetect_Offset 0x07
+#define triggerDuration_Offset  0x08 // duration of the Z-axis pulse sent, in ms
+#define debugEnable_Offset 0x09
+#define voltMeterLong_Offset 0x0a  // For fine-tuning the input volt master
+#define versionRegister_Offset 0x0b
+#define configRegister_Offset 0x0c
+#define identRegister_Offset 0x0d
 
 /*-------------------------Variables------------------------*/
-#define regMapSize  7
-uint8_t maxBytes = 2;
+#define regMapSize  14
+#define maxBytes 2
 #define longBytes 4
 byte regMap[regMapSize];
 byte regMapTemp[regMapSize];
@@ -26,10 +32,11 @@ byte longRcvd[longBytes];
 class pP_i2c {
   public:
     pP_i2c(uint8_t address=pP_i2c_address);
-
     void init();
     void i2cInput(int bytesReceived);
+  private:
+    char _i2cResponse;
 };
 
-#endif
-#endif
+#endif // I2C_INPUT
+#endif // _pP_i2c_h_
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_pins.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_pins.h
index 6de03c2..bd103cb 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_pins.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_pins.h
@@ -29,4 +29,5 @@ Default pins (based on Rev.2.x.xPCB layout)
 #define GADJ_R2 5         // "
 #define GADJ_R3 6         // "
 #define V_FOL_PWM 3       // PWM analog output pin for voltage follower adjustment
-#define VCOMP_PWM 9       // PWM analog output pin for comparator adjustment
\ No newline at end of file
+#define VCOMP_PWM 9       // PWM analog output pin for comparator adjustment
+#define PZDET_PIN 16      // Digital input pin for detecting piezo connection
\ No newline at end of file
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_serial.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_serial.h
index d5c6ab2..63af5e5 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_serial.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_serial.h
@@ -16,7 +16,9 @@ void parseData() {
 void identifyMarkers() {
   
   char x = Serial.read();
-//  char y = Wire.read();
+  #ifdef I2C_INPUT
+  char y = Wire.read();
+  #endif // I2C_INPUT
 
   if (x == '\n' || x == '\r') {
     serialIncoming = true;
@@ -32,25 +34,18 @@ void identifyMarkers() {
   }
 
   #ifdef I2C_INPUT
-    if (y == endMarker) {
-      readInProgress = false;
+    if (y == '\n' || y == '\r') {
       serialIncoming = true;
       inputBuffer[bytesRecvd] = 0;
       parseData();
-    }
-
-    if (readInProgress) {
+      bytesRecvd = 0;
+    } else {
       inputBuffer[bytesRecvd] = y;
       bytesRecvd++;
       if (bytesRecvd == buffSize) {
-      bytesRecvd = buffSize - 1;
+        bytesRecvd = buffSize - 1;
       }
     }
-
-    if (y == startMarker) { 
-      bytesRecvd = 0; 
-      readInProgress = true;
-    }
   #endif
 }
 
@@ -110,6 +105,23 @@ void updateHysteresis() {
 }
 /*------------------------------------------------*/
 
+void updateLogic() {
+  if (serialLong >= 0) {
+    LOGIC = serialLong;
+    EEPROM.put(LOGIC_ADDRESS, LOGIC);
+    pulse();
+  }
+}
+/*------------------------------------------------*/
+
+void updatePzDet() {
+  if (serialLong >= 0) {
+    PZDET = serialLong;
+    EEPROM.put(PZDET_ADDRESS, PZDET);
+  }
+}
+/*------------------------------------------------*/
+
 void updateConstant() {
   if (serialLong >= 0) {
     voltMeterConstant = (long) serialLong;
@@ -168,8 +180,17 @@ void serialPrintConfig() {
   Serial.print("HYST ");
   Serial.println(Hyst);
 
+  Serial.print("LOGIC ");
+  Serial.println(LOGIC);
+
+  Serial.print("PZDET ");
+  Serial.println(PZDET);
+
   Serial.print("VM_CONST ");
   Serial.println(voltMeterConstant);
+  
+  Serial.print("Firmware Version ");
+  Serial.println(PP_VERSION);
 }
 
 void serialPrintState() {
@@ -189,6 +210,15 @@ void serialPrintState() {
 
   Serial.print("\"Err\":");
   Serial.print(ERR_STATE);
+  Serial.print(",");
+
+  Serial.print("\"PzCon\":");
+  Serial.print(PZ_STATE);
+  Serial.print(",");
+
+  Serial.print("\"Firm_Ver\":");
+  Serial.print(PP_VERSION);
+  Serial.print(",");
 
   Serial.println("}");
 }
@@ -213,6 +243,12 @@ void updateParams() {
   else if (strcmp(serialMessageIn, "HYST") == 0) {
     updateHysteresis();
   }
+  else if (strcmp(serialMessageIn, "LOGIC") == 0) {
+    updateLogic();
+  }
+  else if (strcmp(serialMessageIn, "PZDET") == 0) {
+    updatePzDet();
+  }
   else if (strcmp(serialMessageIn, "CONST") == 0) {
     updateConstant();
   }
@@ -222,32 +258,40 @@ void updateParams() {
   else if (strcmp(serialMessageIn, "CONFIG") == 0) {
     serialPrintConfig();
   }
-  else if (strcmp(serialMessageIn, "RESET") == 0) {
-    resetEEPROM();
+  else if (strcmp(serialMessageIn, "ERASE") == 0) {
+    eraseEEPROM();
     serialPrintConfig();
   }
   else if (strcmp(serialMessageIn, "STATE") == 0) {
     serialPrintState();
   }
   else if (strcmp(serialMessageIn, "HELP") == 0) {
-    // Serial.println("To change gain factor: GAIN_F [integer for gain state - see note*]");
-    // Serial.println("To change voltage follower voltage (low threshold): VFOL [float value]");
-    // Serial.println("To change comparator voltage (high threshold): VCOMP [float value]");
-    // Serial.println("To change main loop period: LOOP_D [integer for milliseconds]");
-    // Serial.println("To change trigger active duration: TRG_D [integer for milliseconds]");
-    // Serial.println("To change ADC hysteresis value: HYST [integer]");
-    // Serial.println("To enable or disable debug output: DEBUG [0|1]");
-    // Serial.println("To print current config: CONFIG");
-    // Serial.println("To reset config to defaults: RESET");
-    // Serial.println("To print current state: STATE");
-    // Serial.println("");
-    // Serial.println("Commands are entered in this format:");
-    // Serial.println("CMD VAL");
-    // Serial.println("Commands are confirmed with Enter key");
-    // Serial.println("");
-    // Serial.println("Examples:");
-    // Serial.println("GAIN_F 3 <~ set gain factor to index 3 (6x)");
-    // Serial.println("VFOL 2350 <~ set the vref floor to 2.35V");
+    #if defined(ARDUINO_AVR_ATmega328PB)
+      Serial.println("To change gain factor: GAIN_F [integer for gain state - see note*]");
+      Serial.println("To change voltage follower voltage (low threshold): VFOL [float value]");
+      Serial.println("To change comparator voltage (high threshold): VCOMP [float value]");
+      Serial.println("To change main loop period: LOOP_D [integer for milliseconds]");
+      Serial.println("To change trigger active duration: TRG_D [integer for milliseconds]");
+      Serial.println("To change the output logic: LOGIC [0|1]");
+      Serial.println("  (0 for active low, 1 for active high)");
+      Serial.println("To enable piezo plugged detection: PZDET [0|1]");
+      Serial.println("  (0 for disabled, 1 for enabled)");
+      Serial.println("To change ADC hysteresis value: HYST [integer in millivolts]");
+      Serial.println("To enable or disable debug output: DEBUG [0|1]");
+      Serial.println("To print current config: CONFIG");
+      Serial.println("To set config to defaults: ERASE");
+      Serial.println("To print current state: STATE");
+      Serial.println("");
+      Serial.println("Commands are entered in this format:");
+      Serial.println("CMD VAL");
+      Serial.println("Commands are confirmed with Enter key");
+      Serial.println("");
+      Serial.println("Examples:");
+      Serial.println("GAIN_F 3 <~ set gain factor to index 3 (6x)");
+      Serial.println("VFOL 2350 <~ set the vref floor to 2.35V");
+    #else
+      Serial.println("Check docs.pyroballpcbs.com/config");
+    #endif // defined(ARDUINO_AVR_ATmega328PB)
   }
   parseData();
 }    
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.h
index 38852e1..a3f5e07 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_volatile.h
@@ -3,6 +3,7 @@ volatile int sensorHReading = 0;      // variable to store the value read from t
 volatile int ADJ_FOLLOW = 0;          // Variable for Follower adjustment
 volatile int ADJ_COMP = 0;            // Variable for Comparator adjustment
 volatile int ERR_STATE = 0;
+volatile int PZ_STATE = 0;
 
 int Vin = 5000;                   // input reference voltage in millivolts (multiply V by 1000)
 int VOld = 5000;                  // Variable to store previous cycle's Vin
@@ -23,7 +24,7 @@ int VFol = 0;
 
 // Error blink parameters
 
-int BlinkState = LOW;
+int BlinkState = 0;
 int BlinkCount = (InitCount * 2) + 1;   // Multiply Blink count by 2 to handle toggle state, add one extra to make sure light is on after
 
 // Serial Input Parsing Variables
diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/version_git.py b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/version_git.py
new file mode 100644
index 0000000..760556b
--- /dev/null
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/version_git.py
@@ -0,0 +1,4 @@
+import subprocess
+
+major_version = "2.2.1"
+print("-DPP_VERSION=\\\"" + major_version + "_" + subprocess.check_output(["git", "rev-parse", "HEAD"])[0:6] + "\\\"")
diff --git a/mkdocs.yml b/mkdocs.yml
index 822f4c4..9313d50 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -59,6 +59,9 @@ nav:
         - Makerbot Original Under Bed: 'mounts/quadrap/makerbot-under-bed.md'
         - Ultimaker Under Bed: 'mounts/quadrap/um-under-bed.md'
   - Configuration:
+    - Update Sensor:
+      - Sensor UART Wiring: 'schematics/other/uart-programmer-wiring.md'
+      - Beta v2.x.x: 'tutorials/firmware-update/beta-unit-firmware-update.md'
     - Pyr0-Piezo Config: 'config.md'
     - Settings Explaination: 'tutorials/config/pyr0piezo-parameters/pyr0piezo-parameters.md'
     - Printer Firmware Config:
@@ -87,6 +90,8 @@ nav:
     - Changelog:
       - Version List: 'changelog.md'
       - Logs:
+        - 'v2.2.0-v2.2.1': 'changelogs/changelog_2020-01-16_v2.2.0_v2.2.1.md'
+        - 'v2.1.5-v2.1.6': 'changelogs/changelog_2019-12-28_v2.1.5_v2.1.6.md'
         - 'v2.1.4-v2.1.5': 'changelogs/changelog_2019-10-30_v2.1.4_v2.1.5.md'
         - 'v2.1.3-v2.1.4': 'changelogs/changelog_2019-10-09_v2.1.3_v2.1.4.md'
         - 'v2.1.2-v2.1.3': 'changelogs/changelog_2019-09-25_v2.1.2_v2.1.3.md'