Index: firmware/App/TDCommon.h
===================================================================
diff -u -r6a31b289d2e8e9c19dc08a721135b4f768ba5667 -r4ed766fe84660297858a9af1651e93ff0c4d71f1
--- firmware/App/TDCommon.h	(.../TDCommon.h)	(revision 6a31b289d2e8e9c19dc08a721135b4f768ba5667)
+++ firmware/App/TDCommon.h	(.../TDCommon.h)	(revision 4ed766fe84660297858a9af1651e93ff0c4d71f1)
@@ -29,6 +29,8 @@
 
 // ********** development build switches **********
 
+#define AIR_PUMP_PERCENTAGE_DUTY_CYCLE
+
 #ifndef _RELEASE_
 #ifndef _VECTORCAST_
 //    #define TASK_TIMING_OUTPUT_ENABLED      1           // Re-purposes alarm lamp pins for task timing