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
Returnsvoid
Updated on January 21, 2019 10:05:14am EST

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