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Thread: Basic button example won't work

  1. #1
    Senior Member
    Join Date
    Feb 2020
    Posts
    129

    Basic button example won't work

    Using Teensy 3.2

    I am experimenting with the button press example in Arduino examples and for some reason as soon as i run the program the LED turns on and won't switch off. I wired a momentary switch as explained in the program text between pin 2 and 5v with a 10k pull down. The circuit works but the led won't turn off/on when the button is pressed.


    Should this code work with the T3.2?
    Is digital pin 2 the same as pin 2, the third pin down on the left on the 3.2? Maybe I am connected to the wrong pin???


    HTML Code:
    /*
      Button
    
      Turns on and off a light emitting diode(LED) connected to digital pin 13,
      when pressing a pushbutton attached to pin 2.
    
      The circuit:
      - LED attached from pin 13 to ground
      - pushbutton attached to pin 2 from +5V
      - 10K resistor attached to pin 2 from ground
    
      - Note: on most Arduinos there is already an LED on the board
        attached to pin 13.
    
      created 2005
      by DojoDave <http://www.0j0.org>
      modified 30 Aug 2011
      by Tom Igoe
    
      This example code is in the public domain.
    
      http://www.arduino.cc/en/Tutorial/Button
    */
    
    // constants won't change. They're used here to set pin numbers:
    const int buttonPin = 2;         // the number of the pushbutton pin
    const int ledPin = LED_BUILTIN;  // the number of the LED pin
      // LED_BUILTIN is set to the correct LED pin independent of which board is used
    
    // variables will change:
    int buttonState = 0;         // variable for reading the pushbutton status
    
    void setup() {
      // initialize the LED pin as an output:
      pinMode(ledPin, OUTPUT);
      // initialize the pushbutton pin as an input:
      pinMode(buttonPin, INPUT);
    }
    
    void loop() {
      // read the state of the pushbutton value:
      buttonState = digitalRead(buttonPin);
    
      // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
      if (buttonState == HIGH) {
        // turn LED on:
        digitalWrite(ledPin, HIGH);
      } else {
        // turn LED off:
        digitalWrite(ledPin, LOW);
      }
    }

  2. #2
    It is the 4th pin down. It goes GND, 0, 1, 2

  3. #3
    Senior Member
    Join Date
    Feb 2020
    Posts
    129
    Nevermind, pin 2 is the forth pin down on the left. ID10T error.

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