diff --git a/boil_kettle/boil_kettle.ino b/boil_kettle/boil_kettle.ino
index 3f7615d..269a964 100644
--- a/boil_kettle/boil_kettle.ino
+++ b/boil_kettle/boil_kettle.ino
@@ -16,12 +16,6 @@
 #include "button.h"
 #include "slowPWM.h"
 
-// Pin definitions
-#define encoderCLK 2
-#define encoderDT 3
-#define encoderBTN 4
-#define kettlePWM 5
-
 // Global variables.
 byte KettleDuty = 0;
 bool KettleOn = false;
@@ -122,9 +116,9 @@ void UpdateBoilKettle(){
   }
 
   if (KettleOn) {
-    boilPWM.compute(KettleDuty);
+    digitalWrite(kettlePWM, boilPWM.compute(KettleDuty));
   } else {
-    boilPWM.compute(0);
+    digitalWrite(kettlePWM, boilPWM.compute(0));
   }
 }
 
diff --git a/boil_kettle/slowPWM.h b/boil_kettle/slowPWM.h
index a1e7c69..3acfeae 100644
--- a/boil_kettle/slowPWM.h
+++ b/boil_kettle/slowPWM.h
@@ -20,7 +20,7 @@ class slowPWM {
       Serial.println("Setup PWM");
     }
 
-    void compute(byte duty) {
+    byte compute(byte duty) {
       unsigned long onTime = (duty * period) / 100;
       unsigned long offTime = period - onTime;
       unsigned long currentTime = millis();
@@ -35,7 +35,8 @@ class slowPWM {
         lastSwitchTime = currentTime;
         outputState = HIGH;
       }
-      digitalWrite(outputPin, outputState);
+
+      return outputState;
     }
 };
 #endif