diff --git a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h
index aea4a1b..693aa32 100644
--- a/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h
+++ b/firmware/AVR-Source/Pyr0_Piezo_Sensor_v2.x.x/src/pP_function.h
@@ -130,11 +130,11 @@ void calibrateAlert() {
 void adjustGain() {
   switch (GAIN_FACTOR)
   {
-  case 4:
+  case 0:
     pinMode(GADJ_R0, OUTPUT);
     digitalWriteFast(GADJ_R0, LOW);
     break;
-  case 3:
+  case 1:
     pinMode(GADJ_R1, OUTPUT);
     digitalWriteFast(GADJ_R1, LOW);
     pinMode(GADJ_R0, INPUT);
@@ -145,14 +145,14 @@ void adjustGain() {
     pinMode(GADJ_R1, INPUT);
     pinMode(GADJ_R0, INPUT);
     break;
-  case 1:
+  case 3:
     pinMode(GADJ_R3, OUTPUT);
     digitalWriteFast(GADJ_R3, LOW);
     pinMode(GADJ_R2, INPUT);
     pinMode(GADJ_R1, INPUT);
     pinMode(GADJ_R0, INPUT);
     break;
-  case 0:
+  case 4:
   default:
     pinMode(GADJ_R3, INPUT);
     pinMode(GADJ_R2, INPUT);