internal pull up r's

Projects Programming
2

Set your pin mode to input instead of output and then you're on your way.

I know it looks wrong to be writing to a pin set to INPUT mode, but that's just how the arduino works for turning on the resistors.

void setup(){ 
  Serial.begin(9600);
  pinMode(supfanled, INPUT);           // supply fan led o/p 
  digitalWrite(supfanled, HIGH);        // turn on pullup resistors
}