//

// See also:

// https://editor.p5js.org/jonfroehlich/sketches/Szs_sh4qI

// 

// By Jon E. Froehlich

// @jonfroehlich

// http://makeabilitylab.io/

//

​

​

let pHtmlMsg;

let serialOptions = { baudRate: 115200  };

let serial;

let curSerialVal = 0; // should be between 0 and 1

let currentXPos = 0;

​

function setup() {

  createCanvas(400, 400);

​

  // Setup Web Serial using serial.js

  serial = new Serial();

  serial.on(SerialEvents.CONNECTION_OPENED, onSerialConnectionOpened);

  serial.on(SerialEvents.CONNECTION_CLOSED, onSerialConnectionClosed);

  serial.on(SerialEvents.DATA_RECEIVED, onSerialDataReceived);

  serial.on(SerialEvents.ERROR_OCCURRED, onSerialErrorOccurred);

​

  // If we have previously approved ports, attempt to connect with them

  serial.autoConnectAndOpenPreviouslyApprovedPort(serialOptions);

​

  // Add in a lil <p> element to provide messages. This is optional

  pHtmlMsg = createP("Click anywhere on this page to open the serial connection dialog");

  pHtmlMsg.style('color', 'deeppink');

  bgColor = color(100);

  stroke("white");

}

​

function draw() {

  // Check if current x position is off graph; if so. Clear!

  if(currentXPos > width || currentXPos == 0){

    currentXPos = 0;

    background(100);

  }

​

  const yStart = height;

  const yLineHeight = curSerialVal * height;

  const yEnd = yStart - yLineHeight;

  line(currentXPos, yStart, currentXPos, yEnd);

  currentXPos++;

}

​

/**

 * Callback function serial.js when new web serial data is received

 * 

 * @param {*} eventSender 

 * @param {String} newData new data received over serial

 */

function onSerialDataReceived(eventSender, newData) {

  console.log("onSerialDataReceived", newData);

  pHtmlMsg.html("onSerialDataReceived: " + newData);

  curSerialVal = parseFloat(newData);

}

​

/**

 * Callback function by serial.js when there is an error on web serial

 * 

 * @param {} eventSender 

 */

 function onSerialErrorOccurred(eventSender, error) {

  console.log("onSerialErrorOccurred", error);

  pHtmlMsg.html(error);

}

​

/**

 * Callback function by serial.js when web serial connection is opened

 * 

 * @param {} eventSender 

 */

function onSerialConnectionOpened(eventSender) {

  console.log("onSerialConnectionOpened");

  pHtmlMsg.html("Serial connection opened successfully");

}

​

/**

 * Callback function by serial.js when web serial connection is closed

 * 

 * @param {} eventSender 

 */

function onSerialConnectionClosed(eventSender) {

  console.log("onSerialConnectionClosed");

  pHtmlMsg.html("onSerialConnectionClosed");

}

​

/**

 * Called automatically by the browser through p5.js when mouse clicked

 */

function mouseClicked() {

  if (!serial.isOpen()) {

    serial.connectAndOpen(null, serialOptions);

  }

}