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[on:]

Code:

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

[Reply #1 on:]

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.

Code:

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

[Reply #2 on:]

thank you, ive got it amazing, internal r's

[Reply #3 on:]

@jonisonvespa: Are you using Ardunio IDE 1.0?

[Reply #4 on:]

Try using:
    pinMode(n, INPUT_PULLUP);
where n is your pin number.

[Reply #5 on:]

Try using:
    pinMode(n, INPUT_PULLUP);

What version of the IDE is that?

[Reply #6 on:]

Release candidate 2 (-rc2).  I think release candidate 1 has it as well.

[Reply #7 on:]

What's INPUT_PULLUP when it's at home? Wouldn't PULLUP be better?

[Reply #8 on:]

Try using:
    pinMode(n, INPUT_PULLUP);
where n is your pin number.

Its counter-productive to suggest something that cannot work for the current major release.

[Reply #9 on:]

pinMode(fan1, INPUT_PULLUP);


tyred that but got, was not declared at this scope, im using arduino 1.0

[Reply #10 on:]

It isn't released yet, which is why posting it was counter-productive.

Just use the pinMode (x, INPUT)/digitalWrite(x, HIGH) method.

[Reply #11 on:]

ok thank you awal

[Reply #12 on:]

Sorry for the confusion.  I am still rather new to this and I just learned about the INPUT_PULLUP parameter.  I had not used very many previous versions of the IDE so I did not know it was so new.

Did not mean to cause any problems.

BTW: RC2 is working great for me.