Don Coleman - Creating Bluetooth Low Energy Peripherals with Arduino

Creating Bluetooth LE

Peripherals with Arduino

Maker Faire NY - Oct 1, 2016

Don Coleman - Chariot Solutions

@doncoleman

Arduino BLE Peripheral

https://github.com/sandeepmistry/arduino-BLEPeripheral

Adafruit Bluefruit LE nRF8001 Breakout

RedBearLab BLE Shield 2.1

Other RedBearLab boards

Compatible Hardware

Compatible Hardware List

Arduino 101

https://www.arduino.cc/en/Main/ArduinoBoard101

Arduino 101 - CurieBLE

https://www.arduino.cc/en/Reference/CurieBLE

Lightbulb Service

Light Switch
Dimmer Setting

Lightbulb Service - FF10

16 bit UUIDs

0000FF10-0000-1000-8000-00805F9B34FB

0000FF11-0000-1000-8000-00805F9B34FB

0000FF12-0000-1000-8000-00805F9B34FB

Lightbulb Service - FF10

LED.ino (BLEPeripheral library)


#include <BLEPeripheral.h>

LED.ino (Arduino 101)


#include <CurieBLE.h>

Create BLE Peripheral


BLEPeripheral blePeripheral;

Create Service


BLEService ledService("FF10");

Characteristics & Descriptors


BLECharCharacteristic
    switchCharacteristic("FF11", BLERead | BLEWrite);

BLEDescriptor switchDescriptor("2901", "Switch");

Characteristics & Descriptors


BLEUnsignedCharCharacteristic
    dimmerCharacteristic("FF12", BLERead | BLEWrite);

BLEDescriptor dimmerDescriptor("2901", "Dimmer");

LED pin


const int LED_PIN = 6;

Setup

void setup() {
  Serial.begin(9600);
  pinMode(LED_PIN, OUTPUT);

  blePeripheral.addAttribute(ledService);
  blePeripheral.addAttribute(switchCharacteristic);
  blePeripheral.addAttribute(switchDescriptor);
  blePeripheral.addAttribute(dimmerCharacteristic);
  blePeripheral.addAttribute(dimmerDescriptor);

  // ...
}

Setup

void setup() {
  // ...
  switchCharacteristic.setEventHandler(
              BLEWritten, switchCharacteristicWritten);
  dimmerCharacteristic.setEventHandler(
              BLEWritten, dimmerCharacteristicWritten);

  blePeripheral.setAdvertisedServiceUuid(
                                    ledService.uuid());
  blePeripheral.setLocalName("LED");
  blePeripheral.begin();
}

Loop


  void loop() {
    blePeripheral.poll();
  }

Switch Characteristic Written

void switchCharacteristicWritten(
    BLECentral& central,
    BLECharacteristic& characteristic) {

  if (switchCharacteristic.value()) {
    digitalWrite(LED_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
  }
}

Dimmer Characteristic Written

void dimmerCharacteristicWritten(
    BLECentral& central,
    BLECharacteristic& characteristic) {
  
  analogWrite(LED_PIN, dimmerCharacteristic.value());
}

Demo

Thermometer Service - BBB0

MCP9808 High Accuracy I2C Temperature Sensor Breakout Board

Service, Characteristic, & Descriptor


BLEService thermometerService("BBB0");

BLEFloatCharacteristic tempCharacteristic("BBB1",
                                  BLERead | BLENotify);

BLEDescriptor temperatureDescriptor("2901", "degrees C");

Loop

void loop()
{
  blePeripheral.poll();

  if(millis() - previousMillis > interval) {
      readTemperatureSensor();
      previousMillis = millis();
  }
}

Read Temperature Sensor

void readTemperatureSensor()
{
  float temp = tempSensor.readTempC();

  if (tempCharacteristic.value() != temp) {
    tempCharacteristic.setValue(temp);
  }
}