Index: firmware/App/DDCommon.h
===================================================================
diff -u -r27e8758fa6199e72b914e1199786a4396ce74d06 -r89c8709e3b27648926fbb20f25c9a67cbeb99adc
--- firmware/App/DDCommon.h	(.../DDCommon.h)	(revision 27e8758fa6199e72b914e1199786a4396ce74d06)
+++ firmware/App/DDCommon.h	(.../DDCommon.h)	(revision 89c8709e3b27648926fbb20f25c9a67cbeb99adc)
@@ -1,14 +1,14 @@
 /**************************************************************************
 *
-* Copyright (c) 2024-2025 Diality Inc. - All Rights Reserved.
+* Copyright (c) 2024-2026 Diality Inc. - All Rights Reserved.
 *
 * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
 * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
 *
 * @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
@@ -25,7 +25,7 @@
 #define DD_VERSION_MAJOR        0
 #define DD_VERSION_MINOR        0
 #define DD_VERSION_MICRO        0
-#define DD_VERSION_BUILD  24
+#define DD_VERSION_BUILD  40
 
 // ********** development build switches **********
 
@@ -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 +57,8 @@
 //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>