// date: 13 April 2023

// class: Intro to IM

// professor: Michael Shiloh

// description:

// week 11 homework ex.2 -

// changing LED brightness by clicking on screen

​

let left = 0;

let right = 0;

let brightness = 0;

​

function setup() {

  createCanvas(640, 480);

  textSize(18);

}

​

function draw() {

  background(255, 230, 240);

  stroke(200, 20, 200);

  line(width / 2, 0, width / 2, height);

  noStroke();

  if (!serialActive) {

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

  } else {

    text("Connected", 20, 30);

    text("dimmer", width / 5, height / 2);

    text("brighter", width / 1.45, height / 2);

    //check if count is correct

    print(

      "left:" +

        (left - 1) +

        ", " +

        "right:" +

        right +

        ", " +

        "brightness:" +

        brightness

    );

  }

}

​

function mousePressed() {

  // click on left side of the screen -> LED gets dimmer

  // click on right side of the screen -> LED gets brighter

  if (mouseX <= width / 2) {

    left++;

    brightness = brightness - 10;

  } else {

    right++;

    brightness = brightness + 10;

  }

  // check if brightness reaches limits

  if (brightness <= 0) {

    brightness = 0;

  } else if (brightness >= 255) {

    brightness = 255;

  }

}

​

function keyPressed() {

  if (key == " ") {

    // important to have in order to start the serial connection!!

    setUpSerial();

  }

}

​

function readSerial(data) {

  if (data != null) {

    // make sure there is actually a message

    // split the message

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

    // if the right length, then proceed

    if (fromArduino.length == 1) {

      // only store values here

      // do everything with those values in the main draw loop

    }

​

    //////////////////////////////////

    //SEND TO ARDUINO HERE (handshake)

    //////////////////////////////////

    let sendToArduino = brightness + "\n";

    writeSerial(sendToArduino);

  }

}

​

//Arduino Code

/*

int ledPin = 5;

​

void setup() {

  Serial.begin(9600);

  pinMode(LED_BUILTIN, OUTPUT);

  pinMode(ledPin, OUTPUT);

  // start the handshake

  while (Serial.available() <= 0) {

    digitalWrite(LED_BUILTIN, HIGH); // on/blink while waiting for serial data

    Serial.println("0,0"); // send a starting message

    delay(300);            // wait 1/3 second

    digitalWrite(LED_BUILTIN, LOW);

    delay(50);

  }

}

​

void loop() {

  // wait for data from p5 before doing something

  while (Serial.available()) {

    digitalWrite(LED_BUILTIN, HIGH); // led on while receiving data

    int brightness = Serial.parseInt();

    if (Serial.read() == '\n') {

      delay(5);

      Serial.println("1");

    }

    analogWrite(ledPin, brightness);

  }

  digitalWrite(LED_BUILTIN, LOW);

}

*/

​