Control the brightness of an LED through p5.

​

Arduino code:

https://github.com/vsharkovski/nyuad-coursework/blob/main/introim/arduino/led-p5/led-p5.ino

*/

​

let lastDistance = 0;

​

function setup() {

  createCanvas(640, 480);

  textSize(18);

}

​

function draw() {

  background(0);

  fill(255);

​

  if (!serialActive) {

    text("Press Space Bar to select Serial Port", 20, 30);

  } else {

    text("Connected", 20, 30);

    ellipseMode(CENTER);

    stroke(255);

    noFill();

    ellipse(width / 2, height / 2, 50, 50);

    if (mouseIsPressed) {

      lastDistance = dist(width / 2, height / 2, mouseX, mouseY);

      line(width / 2, height / 2, mouseX, mouseY);

    }

  }

}

​

function keyPressed() {

  if (key == " ") {

    setUpSerial();

  }

}

​

function readSerial(data) {

  if (data != null) {

    // Make sure there is actually a message. Split the message.

    let fromArduino = split(trim(data), ",");

    if (fromArduino.length == 1) {}

​

    // Send to Arduino.

    let bright = map(lastDistance, 0, sqrt(height*height + width*width), 0, 255);

    bright = round(bright);

    if (frameCount % 60 == 0) {

      print("brightness", bright);

    }

    let sendToArduino = `${bright}\n`;

    writeSerial(sendToArduino);

  }

}

​