​

const track = "44E1F33C-0AB5-4288-A3A2-1F2AE16A3AE1"; //tracking service

const trackButton1 = "5D5DAE3C-2D66-4117-A2AD-9800CA0C9208";//characteristic to be tracked

​

//convert the UUIDs to lower case

let tracker = track.toLowerCase();

let trackButton = trackButton1.toLowerCase();

​

let BleDevice = new p5ble();//our 'device'

let buttonStatus;//variable to track the status

let button; //this will be used keep the found characteristics

​

function setup() 

{

  createCanvas(400, 400);

  const connectButton = createButton("CONNECT TO DEVICE");//creating a button to connect to the BLE device

  connectButton.position(50, 50);

  connectButton.mousePressed(connectToDevice);//when the button on P5 is pressed, connect to the device

  const trackingButton = createButton("TRACK BUTTON STATUS");//create a button to track the status of the button on the Board

  trackingButton.position(50, 200);

  trackingButton.mousePressed(readValue);

}

​

function draw() 

{

  background(220);

  if(buttonStatus !== undefined)

    { text("Button Status is: ",50, 250);

      text(Number(buttonStatus), 50, 300);

      if(buttonStatus)

        {

          background(255, 0, 255);

        }

      else

        {

          background(230, 255, 1);

        }

    }

}

​

//function to connect to to the device

function connectToDevice()

{

  BleDevice.connect(tracker, findChar);//connect and find characteristics

}

//function to search for characteristics

//this function takes in an array of characteristics and search for what is needed

function findChar(error, characteristics)

{

  if(error)//if an erros occurs

    {

      console.log("This error occured: ", error);

      return;

    }

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

    {

      if(characteristics[i].uuid == trackButton)//if button tracker is found

        {

          button = characteristics[i];

          console.log("Button tracker found");

        }

    }

  if(!button)//if the button tracker is not found

    {

      console.log("Button Tracker Not Found");

    }

}

//function to read value

function readValue()

{

  if(!button)//if 

    {

      console.log("Connection error");

      return;

    }

  BleDevice.read(button, checkValue);

}

//function to check value

function checkValue(error, value)

{

  if(error)

    {

      console.log("This error occured: ", error)

      return;

    }

  buttonStatus = value;

  console.log("Button is set to: ", Number(value));

}