Read From One Characteristic · P5.ble.js - ITP

Home » Arduino Ble Readvalue » Read From One Characteristic · P5.ble.js - ITP

Maybe your like

Live Demo

Read from one characteristic using p5.ble.js with callbacks

Arduino Code

Arduino Code can be found here.

p5 Code

// The serviceUuid must match the serviceUuid of the device you would like to connect const serviceUuid = "19b10010-e8f2-537e-4f6c-d104768a1214"; let myCharacteristic; let myValue = 0; let myBLE; function setup() { colorMode(HSB, 255); // Create a p5ble class myBLE = new p5ble(); createCanvas(200, 200); textSize(20); textAlign(CENTER, CENTER); // Create a 'Connect' button const connectButton = createButton("Connect"); connectButton.mousePressed(connectToBle); } function connectToBle() { // 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: ", characteristics); myCharacteristic = characteristics[0]; // Read the value of the first characteristic myBLE.read(myCharacteristic, gotValue); } // A function that will be called once got values function gotValue(error, value) { if (error) console.log("error: ", error); console.log("value: ", value); myValue = value; // After getting a value, call p5ble.read() again to get the value again myBLE.read(myCharacteristic, gotValue); // You can also pass in the dataType // Options: 'unit8', 'uint16', 'uint32', 'int8', 'int16', 'int32', 'float32', 'float64', 'string' // myBLE.read(myCharacteristic, 'string', gotValue); } function draw() { if (myValue || myValue === 0) { background(myValue, 255, 255); // Write value on the canvas text(myValue, 100, 100); } }

p5 Code Source

Demo Video

1. Read button value from Arduino Nano 33 BLE board in a p5 sketch:

Circuit board for Arduino Nano 33 BLE with a button:

2. Read potentiometer value from Arduino Nano 33 BLE board in a p5 sketch:

Circuit board for Arduino Nano 33 BLE with a potentiometer::

Try it in p5 Web Editor

  • Read one Characteristic - Button
  • Read one Characteristic - Potentiometer

Tag » Arduino Ble Readvalue