Index: firmware/App/HDCommon.h
===================================================================
diff -u -raf2674758d7b9dbe05e348b318845975b423509f -r975a29bff552a9e657364bd36b11c4d491cf7fae
--- firmware/App/HDCommon.h	(.../HDCommon.h)	(revision af2674758d7b9dbe05e348b318845975b423509f)
+++ firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 975a29bff552a9e657364bd36b11c4d491cf7fae)
@@ -56,6 +56,7 @@
 //    #define FLOW_DEBUG                      1           // test build sends flow, signal strength, and occlusion readings to debug UART
 //    #define EMC_TEST_BUILD                  1           // EMC test build - HD/DG run separately but connected, HD pumps toggle on/off w/ stop button
     #define ALARMS_DEBUG                    1           // triggered alarms sent to debug UART
+    #define V1_5_SYSTEM                     1           // build for v1.5 system
 
     #include <stdio.h>
     #include <strings.h>