- Processing
- p5.js
- Processing.py
- Processing for Android
- Processing for Pi

- Processing Foundation

This reference is for Processing 3.0+. If you have a previous version, use the reference included with your software in the Help menu. If you see any errors or have suggestions, please let us know. If you prefer a more technical reference, visit the Processing Core Javadoc and Libraries Javadoc.

Class | GPIO
Name | ### digitalWrite()
Examples |
    import processing.io.*;
    boolean ledOn = false;

    void setup() {
      GPIO.pinMode(4, GPIO.OUTPUT);

      // On the Raspberry Pi, GPIO 4 is pin 7 on the pin header,
      // located on the fourth row, above one of the ground pins

      frameRate(0.5);
    }

    void draw() {
      ledOn = !ledOn;
      if (ledOn) {
        GPIO.digitalWrite(4, GPIO.LOW);
        fill(204);
      } else {
        GPIO.digitalWrite(4, GPIO.HIGH);
        fill(255);
      }
      stroke(255);
      ellipse(width/2, height/2, width*0.75, height*0.75);
    }
Description | Sets an output pin to be either high or low You need to set the pin to output by calling pinMode() before calling this function. Unlike on Arduino, it is not possible to set a input pin's internal pull-up resistor using this function.
Syntax |
    .digitalWrite(pin, value)
Parameters |
pin | int: GPIO pin
value | int: GPIO.HIGH (1) or GPIO.LOW (0)
value | boolean: true or false
Returns | void

Updated on July 4, 2018 11:56:46am EDT