Index: webserver/example/freeRTOSexample/Source/EnergyMeters/Meters_ISRs.c
===================================================================
--- webserver/example/freeRTOSexample/Source/EnergyMeters/Meters_ISRs.c (revision 19)
+++ webserver/example/freeRTOSexample/Source/EnergyMeters/Meters_ISRs.c (revision 22)
@@ -2,7 +2,10 @@
 #include "semphr.h"
 #include "task.h"
+#include "MetersIncludes.h"
 
-extern basementGasReading;
 extern xMetersSemaphore;
+extern xTickCount; /* millisecond tick counter */
+
+void handleGasMeterTick(void);
 
 /* The interrupt entry point. */
@@ -19,5 +22,5 @@
   if ((IO2_INT_STAT_R & (1 << 10)) != 0) /* P2.10 interrupt triggered */
   {
-    basementGasReading++;
+    handleGasMeterTick();
   }
  // else if ((IO2_INT_STAT_R & (1 << n)) != 0) /* some other interrupt triggered */
@@ -56,5 +59,10 @@
 }
 
+void handleGasMeterTick(void)
+{
+  meterItems[METER_INDEX_GAS].timeBeforeLastTick = meterItems[METER_INDEX_GAS].timeLastTick;     /* when did the tick before the last tick occur? */
+  meterItems[METER_INDEX_GAS].timeLastTick = getEpochTimeWithMs(); /* when did the last tick occur? epoch (seconds) */
+  meterItems[METER_INDEX_GAS].valueLastTick = 0;   /* what value did we have at the last tick? */
+  meterItems[METER_INDEX_GAS].valueBeforeLastTick = 1;   /* what value did we have at the tick before the last tick? */
+}
 
-
-