const characteristicsUUID = {

  button:"19b10013-e8f2-537e-4f6c-d104768a1214",

  sensor:"19b10012-e8f2-537e-4f6c-d104768a1214"

}

let buttonCharacteristic;

let sensorCharacteristic;

let buttonValue = 0;

let sensorValue = 0;

let myBLE;

​

function setup() {

  createCanvas(400, 400);

    // Create a p5ble class

  myBLE = new p5ble();

​

  createCanvas(600, 400);

  colorMode(HSB, 255);

  background("#FFF");

​

  // Create a 'Connect and Start Notifications' button

  const connectButton = createButton('Connect and Start Notifications')

  connectButton.mousePressed(connectAndStartNotify);

}

​

function draw() {

   noStroke();

​

  if(buttonValue>0){

    fill(color(200, 200, 200));

  }else{

    fill(color(100, 200, 200));

  }

}

​

function connectAndStartNotify() {

  // Connect to a device by passing the service UUID

  myBLE.connect(serviceUuid, gotCharacteristics);

}

​

// A function that will be called once got characteristics

function gotCharacteristics(error, characteristics) {

  if (error) console.log('error: ', error);

  console.log(characteristics[1].uuid);

  for(let i = 0; i < characteristics.length;i++){

    if(characteristics[i].uuid == characteristicsUUID.button){

      buttonCharacteristic = characteristics[i];

      myBLE.startNotifications(buttonCharacteristic, handleButton);

    }else if(characteristics[i].uuid == characteristicsUUID.sensor){

      sensorCharacteristic = characteristics[i];

      myBLE.startNotifications(sensorCharacteristic, handleSensor);

​

    }else{

      console.log("nothing");

    }

  }

  // Start notifications on the first characteristic by passing the characteristic

  // And a callback function to handle notifications

​

  // You can also pass in the dataType

  // Options: 'unit8', 'uint16', 'uint32', 'int8', 'int16', 'int32', 'float32', 'float64', 'string'

  // myBLE.startNotifications(myCharacteristic, handleNotifications, 'string');

}

​

// A function that will be called once got characteristics

function handleButton(data) {

  //console.log('data: ', data);

  buttonValue = Number(data);

}

​

function handleSensor(data) {

  //console.log('data: ', data);

  sensorValue = Number(data);

  rect(sensorValue, 0, 2, height);

}