Can't workout digitalRead() in processing using firmata

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1

Hi,
I am trying to connect my Arduino uno through firmata into processing. I have uploaded the standardFirmata code to my Arduino uno, added the Arduino/firmata lib to processing. Using this code I have established a working connection between Processing and Arduino IDE. The LED is flashing as it should be but somehow, the digitalRead does not read 1 when the LED is on. The console is continuously printing 0. What should I do? Thanks for help, I am very new to all of this :slight_smile:

import processing.serial.*;
import cc.arduino.*;

Arduino arduino;


int led = 2;

void setup() {
  size(500,500);
  
  println(Arduino.list());
  
  arduino = new Arduino(this, Arduino.list()[2], 57600);
  
  arduino.pinMode(led, Arduino.OUTPUT);
}

void draw(){
  
  arduino.digitalWrite(led, Arduino.HIGH);
  int val = arduino.digitalRead(led);
  println(val);
  delay(1000);
  
  
  arduino.digitalWrite(led, Arduino.LOW);
  rect(250, 250, 100, 100);
  val = arduino.digitalRead(led);
  println("OO");
  delay(1000);
}
2

Why read from the pin?
You know what value you last wrote to the LED pin.

3

For buttons, I simplified the code to the bare minimum but the original idea is: When I press button, the LED turn on, read value on the pin button, turn led pin HIGH and in processing draw AN ellipse.

4

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