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 bb91fda..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
@@ -32,7 +32,7 @@ board = ATmega88P
 framework = arduino
 lib_deps = Arduino
 
-build_flags =
+build_flags = !python version_git.py
 ;    --verbose
 
 upload_protocol = arduino
@@ -58,7 +58,7 @@ board = ATmega328PB
 framework = arduino
 lib_deps = Arduino
 
-build_flags =
+build_flags = !python version_git.py
 ;    --verbose
 
 upload_protocol = arduino
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 7522bf4..d30119f 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
@@ -84,7 +84,7 @@ update the voltMeterConstant variable in pP_config.h with the correct value
 
 ------------------------------------------------------------*/
 
-#define PP_VERSION "2.2.1_882a87"
+// #define PP_VERSION "2.2.1_882a87"
 
 /*  Debug output verbose mode will continuously output sensor readings
     rather than waiting for user input */
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] + "\\\"")