void setup(){ Serial.begin(9600); pinMode(supfanled, OUTPUT); // supply fan led o/p digitalWrite(supfanled, HIGH); // turn on pullup resistors hi just stumbled upon internal pull up r's, is this the correct place (setup) to define the internal pull up r's? thank you

internal pull up r's

system April 20, 2012, 8:14am 6

Try using:
pinMode(n, INPUT_PULLUP);

What version of the IDE is that?