digitalWrite() / Libraries / Processing.org

Name

digitalWrite()

Class

GPIO

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.

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);
}

Syntax

.digitalWrite(pin, value)

Parameters

pin(int)GPIO pin
value(int, boolean)GPIO.HIGH (1) or GPIO.LOW (0)
value(boolean, int)true or false

Return

void

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