Index: firmware/App/DDCommon.h
===================================================================
diff -u -rd3027ebcaa8497e96d9d8eb3d801e64a5751aaa1 -r58e5721497be626929b6cdc0c5187e18b34bbaad
--- firmware/App/DDCommon.h	(.../DDCommon.h)	(revision d3027ebcaa8497e96d9d8eb3d801e64a5751aaa1)
+++ firmware/App/DDCommon.h	(.../DDCommon.h)	(revision 58e5721497be626929b6cdc0c5187e18b34bbaad)
@@ -7,8 +7,8 @@
 *
 * @file    DDCommon.h
 *
-* @author  (last)      Vinayakam Mani
-* @date    (last)      14-Nov-2025
+* @author  (last)      Michael Garthwaite
+* @date    (last)      02-Feb-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  07-Aug-2024
@@ -45,9 +45,6 @@
 //Uncomment below once characterization/study completed
 //#define ENABLE_ALARM_2
 
-//Uncomment below for spent chamber filling
-//#define __SPENT_CHAMBER_FILL__    1
-
 //Uncomment below for bicarb chamber filling
 //#define __BICARB_CHAMBER_FILL__   1
 
@@ -60,6 +57,9 @@
 //Uncomment below to disable heaters debug message
 #define __HEATERS_DEBUG__         1
 
+//Uncomment below to disable Teensy conductivity driver
+#define __TEENSY_CONDUCTIVITY_DRIVER__  1
+
     #include <stdio.h>
     #include <strings.h>
 #endif