Added A/C signal/supply wire (untested) Arduino sketch (without A/c): int potPin = A0; int motorPin = 9; int potValue = 0; int motorValue = 255; void setup() { // Serial.begin(9600); analogWrite (motorPin, motorValue); delay(5000); } void loop() { potValue = analogRead(potPin); motorValue = map(potValue, 0, 1023, 20, 255); analogWrite(motorPin, motorValue); // Serial.print("pot = " ); // Serial.print(potValue); // Serial.print(" motor = "); // Serial.println(motorValue); // delay(2); }