arduino-firmata

arduino-firmata

Arduino Firmata protocol (http://firmata.org) implementation on Node.js.

• Firmata is a protocol to controll Arduino from software on PC.
• You can embed Arduino code into Node.js application.
• Support sharing an Arduino between multiple processes.
• https://github.com/shokai/node-arduino-firmata
• https://npmjs.org/package/arduino-firmata

Install

% npm install arduino-firmata

Requirements

• Arduino (http://arduino.cc)
  • testing with Arduino UNO, Leonardo and Micro.
• Arduino Standard Firmata v2.2
  • Arduino IDE -> [File] -> [Examples] -> [Firmata] -> [StandardFirmata]

Usage

Samples

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

Setup

Connect

var ArduinoFirmata = require('arduino-firmata');
var arduino = new ArduinoFirmata();

arduino.connect(); // use default arduino
arduino.connect('/dev/tty.usb-device-name');

arduino.on('connect', function(){

  console.log("board version"+arduino.boardVersion);
  // your-code-here

});

Close

arduino.close(callback);

I/O

Digital Write

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

Digital Read

arduino.pinMode(7, ArduinoFirmata.INPUT);
console.log( arduino.digitalRead(7) ); // => true/false

Digital Read (event)

arduino.pinMode(7, ArduinoFirmata.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;
  arduino.analogWrite(9, an);
}, 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;
  arduino.analogWrite(11, angle);
}, 1000);

Sysex

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

Send

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

Register Sysex Event

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

Test

Install SysexLedBlinkFirmata into Arduino

• https://github.com/shokai/node-arduino-firmata/blob/master/samples/sysex/StandardFirmataWithLedBlink/StandardFirmataWithLedBlink.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