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

releasePin()
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);
  } else {
    GPIO.digitalWrite(4, GPIO.HIGH);
  }
}

// cleanup on keypress
void keyPressed() {
  GPIO.releasePin(4);
  exit();
}
Description Gives ownership of a pin back to the operating system

Without calling this function, the pin will remain in the current state even after the sketch has been closed.
Syntax
.releasePin(pin)
Parameters
pin int: GPIO pin
Returnsvoid
Updated on January 21, 2019 10:05:14am EST

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