Write to one characteristic

Live Demo

Write 1 or 0 to one characteristic with p5.ble.js

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 = "19b10000-e8f2-537e-4f6c-d104768a1214";
let myCharacteristic;
let input;
let myBLE;

function setup() {
  myBLE = new p5ble();

  // Create a 'Connect' button
  const connectButton = createButton("Connect");
  connectButton.mousePressed(connectToBle);

  // Create a text input
  input = createInput();

  // Create a 'Write' button
  const writeButton = createButton("Write");
  writeButton.mousePressed(writeToBle);
}

function connectToBle() {
  // Connect to a device by passing the service UUID
  myBLE.connect(serviceUuid, gotCharacteristics);
}

function gotCharacteristics(error, characteristics) {
  if (error) console.log("error: ", error);
  console.log("characteristics: ", characteristics);
  // Set the first characteristic as myCharacteristic
  myCharacteristic = characteristics[0];
}

function writeToBle() {
  const inputValue = input.value();
  // Write the value of the input to the myCharacteristic
  myBLE.write(myCharacteristic, inputValue);
}

p5 code Source

Demo Video

Try it in p5 Web Editor