BLE Firmata

Arduino Firmata implementation on BLE (Bluetooth Low Energy) and Node.js.

• Firmata is a protocol to controll Arduino from software on PC.
  • You can embed Arduino code into Node.js application.
• supports BlendMicro.
  • also should works on BLE Shield, but I dont't have it.

sites

• https://github.com/shokai/node-ble-firmata
• https://npmjs.org/package/ble-firmata

Install

% npm install ble-firmata

Requirements

• BlendMicro
  • you have to check pin function. pin 4/6/7 are reserved for BLE controll.
• Install patched Standard Firmata v2.3 to BlendMicro
  • fix #define BLE_NAME "BlendMicro" if you need.
  • download zip

Usage

Samples

• https://github.com/shokai/ble-arduino-firmata/tree/master/samples

Setup

Connect

var BLEFirmata = require('ble-firmata');
var arduino = new BLEFirmata();
 
// search device with BLE peripheral name
arduino.connect("BlendMicro");
 
// search with default name "BlendMicro"
arduino.connect();
 
arduino.on('connect', function(){
 
  console.log("board version"+arduino.boardVersion);
  // your-code-here
 
});

Reset

arduino.reset(callback);

Close

arduino.close(callback);

I/O

Digital Write

arduino.digitalWrite(13, true, callback);
arduino.digitalWrite(13, false, callback);

Digital Read

arduino.pinMode(1, BLEFirmata.INPUT);
console.log( arduino.digitalRead(1) ); // => true/false

Digital Read (event)

arduino.pinMode(1, BLEFirmata.INPUT);
 
arduino.on('digitalChange', function(e){
  console.log("pin" + e.pin + " : " + e.old_value + " -> " + e.value);
});

Analog Write (PWM)

setInterval(function(){
  var an = Math.random()*255; // 0 ~ 255
  arduino.analogWrite(9, an, callback);
}, 100);

Analog Read

console.log( arduino.analogRead(0) ); // => 0 ~ 1023

Analog Read (event)

arduino.on('analogChange', function(e){
  console.log("pin" + e.pin + " : " + e.old_value + " -> " + e.value);
});

Servo Motor

setInterval(function(){
  var angle = Math.random()*180; // 0 ~ 180
  arduino.servoWrite(11, angle, callback);
}, 1000);

Sysex

• http://firmata.org/wiki/V2.1ProtocolDetails#Sysex_Message_Format
• https://github.com/shokai/ble-arduino-firmata/tree/master/samples/sysex

Send

arduino.sysex(0x01, [13, 5, 2], callback);  // command, data_array, callback

Register Sysex Event

arduino.on('sysex', function(e){
  console.log("command : " + e.command);
  console.log(e.data);
});

Debug

set DEBUG env var

% DEBUG=ble-firmata node samples/analog_write.js
% DEBUG=*ble* node samples/analog_write.js

Test

Install SysexLedBlinkFirmata into Arduino

• https://github.com/shokai/node-ble-firmata/blob/master/samples/sysex/BLEFirmataWithLedBlink/BLEFirmataWithLedBlink.ino

Run Test

% npm install
% npm test

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request