Floating pin with pullup and no external components

Using Arduino Programming Questions
1

I have an Arduino Micro, and I'm trying to get the button example to work.
I'm getting a floating pin for some reason, in the end I disconnected everything, and still getting the same results. The serial monitor is showing a lot of '1's and '0's without anything connected to it, and using the internal pull-up.
What am I doing wrong?

const int pinButton = 2;
int buttonState = 0;
int previousButtonState = HIGH; 

void setup() {
  Serial.begin(9600);
  while (!Serial) ; 

  delay(1000);
}

void loop() {
  buttonState = digitalRead(pinButton);
  Serial.println(buttonState);

  if (buttonState == HIGH) {
    //digitalWrite(LED_BUILTIN, LOW);
  } else {
    //digitalWrite(LED_BUILTIN, HIGH);
  }
}
2

No schematic, no code tags.

No pinMode (though input is the default)

I'm not seeing that.

1 Like
3

Run pinMode() in setup() to clarify the purpose of the pin.

4

Sorry, my bad, had the issue with more code, made a smaller afterwards and forgot the pullup.

Added code tags.

Didn't add schematic as the problem was for no components attached.

I will try adding the button again and see what happens

5

FYI

1 Like
6

I was using INPUT_PULLUP, however, I have an Arduino Micro, not UNO.
Is there a similar diagram with which pins are best for pullup in the Micro board?

Got it to work now. thx for the help!

7

Digital pins are digital pins, the micro is similar in this respect.

Just poll the switch(s) every 50ms.

8

I got it to work with the debouncing example. Don't want to add too many delays if not needed. Thx anyway

9

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