Processing

Reference+
Documentation→Libraries→Core→Hardware I/O→GPIO

Name

releasePin()

Class

GPIO

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.

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();
}

Syntax

  • .releasePin(pin)

Parameters

  • pin(int)GPIO pin

Return

  • void
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