diff --git a/.circleci/config.yml b/.circleci/config.yml
index 9ee040a9f..52af783b7 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -64,7 +64,7 @@ build_firmware_steps: &build_firmware_steps
         command: |
           echo $MIX_TARGET > MIX_TARGET
           echo $MIX_ENV > MIX_ENV
-          cp mix.lock.$MIX_TARGET MIX_LOCK
+          cp mix.lock MIX_LOCK
     - restore_cache:
         key: v8-fbos-{{ checksum "MIX_TARGET" }}-{{ checksum "MIX_ENV" }}-dependency-cache-{{ checksum "MIX_LOCK" }}
     - restore_cache:
@@ -83,7 +83,7 @@ build_firmware_steps: &build_firmware_steps
     - run:
         name: Create artifacts
         command: |
-          cp _build/${MIX_TARGET}/${MIX_ENV}/nerves/images/farmbot.fw /nerves/deploy/system/artifacts/farmbot-${MIX_TARGET}-$(cat VERSION).fw
+          cp _build/${MIX_TARGET}_${MIX_ENV}/nerves/images/farmbot.fw /nerves/deploy/system/artifacts/farmbot-${MIX_TARGET}-$(cat VERSION).fw
     - save_cache:
         key: v8-fbos-{{ checksum "MIX_TARGET" }}-{{ checksum "MIX_ENV" }}-dependency-cache-{{ checksum "MIX_LOCK" }}
         paths:
@@ -104,7 +104,7 @@ deploy_nerves_hub_firmware_steps: &deploy_nerves_hub_firmware_steps
         command: |
           echo $MIX_TARGET > MIX_TARGET
           echo $MIX_ENV > MIX_ENV
-          cp mix.lock.$MIX_TARGET MIX_LOCK
+          cp mix.lock MIX_LOCK
     - restore_cache:
         key: v8-fbos-{{ checksum "MIX_TARGET" }}-{{ checksum "MIX_ENV" }}-dependency-cache-{{ checksum "MIX_LOCK" }}
     - restore_cache:
@@ -145,8 +145,8 @@ jobs:
       - save_cache:
           key: v8-fbos-host-test-dependency-cache-{{ checksum "mix.lock.host" }}
           paths:
-            - _build/host
-            - deps/host
+            - _build/host_test
+            - deps
 
 ################################################################################
 #                           target=rpi app_env=prod                            #
@@ -261,7 +261,7 @@ jobs:
           name: Setup ENV
           command: |
             echo rpi3 > MIX_TARGET_RPI3
-            cp mix.lock.rpi3 MIX_LOCK_RPI3
+            cp mix.lock MIX_LOCK_RPI3
             # echo rpi > MIX_TARGET_RPI
             # cp mix.lock.rpi MIX_LOCK_RPI
             echo $MIX_ENV > MIX_ENV
@@ -316,7 +316,7 @@ jobs:
           name: Setup ENV
           command: |
             echo rpi3 > MIX_TARGET_RPI3
-            cp mix.lock.rpi3 MIX_LOCK_RPI3
+            cp mix.lock MIX_LOCK_RPI3
             # echo rpi > MIX_TARGET_RPI
             # cp mix.lock.rpi MIX_LOCK_RPI
             echo $MIX_ENV > MIX_ENV
diff --git a/mix.lock b/mix.lock
index 9d7ed900a..8db3c4f92 100644
--- a/mix.lock
+++ b/mix.lock
@@ -6,6 +6,7 @@
   "bbmustache": {:hex, :bbmustache, "1.6.1", "9fb63fa60bd53afbf47f02e6d8bd6b2beafc068e02e20975254dc7461fd4f397", [:rebar3], [], "hexpm"},
   "bunt": {:hex, :bunt, "0.2.0", "951c6e801e8b1d2cbe58ebbd3e616a869061ddadcc4863d0a2182541acae9a38", [:mix], [], "hexpm"},
   "certifi": {:hex, :certifi, "2.5.1", "867ce347f7c7d78563450a18a6a28a8090331e77fa02380b4a21962a65d36ee5", [:rebar3], [{:parse_trans, "~>3.3", [hex: :parse_trans, repo: "hexpm", optional: false]}], "hexpm"},
+  "circuits_gpio": {:hex, :circuits_gpio, "0.4.0", "f1ce5a50921b13f23847c47589b51bdd93afe372fabfb9a58497cad515a5cc98", [:make, :mix], [{:elixir_make, "~> 0.5", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm"},
   "circuits_uart": {:hex, :circuits_uart, "1.3.1", "8c0a56f06828133a0b08363ecb994350a9529d388a912357d31829ae617cd801", [:mix], [{:elixir_make, "~> 0.4", [hex: :elixir_make, repo: "hexpm", optional: false]}], "hexpm"},
   "combine": {:hex, :combine, "0.10.0", "eff8224eeb56498a2af13011d142c5e7997a80c8f5b97c499f84c841032e429f", [:mix], [], "hexpm"},
   "connection": {:hex, :connection, "1.0.4", "a1cae72211f0eef17705aaededacac3eb30e6625b04a6117c1b2db6ace7d5976", [:mix], [], "hexpm"},