Reference+
Name
digitalRead()
Class
GPIO
Description
Returns the value of an input pin, which is either GPIO.HIGH (1)
or GPIO.LOW (0)
You need to set the pin to input by calling
pinMode() before calling this function.
Examples
import processing.io.*; // On the Raspberry Pi GPIO 4 is physical pin 7 on the header void setup() { // INPUT_PULLUP enables the built-in pull-up resistor for this pin // left alone, the pin will read as HIGH // connected to ground (via e.g. a button or switch) it will read LOW GPIO.pinMode(4, GPIO.INPUT_PULLUP); } void draw() { if (GPIO.digitalRead(4) == GPIO.LOW) { // button is pressed fill(255); } else { // button is not pressed fill(204); } stroke(255); ellipse(width/2, height/2, width*0.75, height*0.75); }
Syntax
.digitalRead(pin)
Parameters
pin
(int)
GPIO pin
Return
int
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