ruby arduino hacking

Arduino Hello World

flashing LED

Arduino Hello World

flashing LED

							void setup() {                
							  pinMode(13, OUTPUT);     
							}

							void loop() {
							  digitalWrite(13, HIGH);
							  delay(1000);
							  digitalWrite(13, LOW);
							  delay(1000);
							}
						

RAD

Ruby Arduino Development

http://rad.rubyforge.org/

DSL, ruby2c

RAD Example

gem install rad

rad my_sketch

							class MySketch < ArduinoSketch
							  output_pin 13, :as => :led
							  def loop
							    blink led, 1000
							  end
							end
						

rake make:upload

RAD Drawbacks

Only Support Ruby 1.8

Inactive development

Write - Upload - Run

Ruby Serialport Gem

http://ruby-serialport.rubyforge.org/

Ruby code

							require 'rubygems'
							require 'serialport'

							sp = SerialPort.new "/dev/ttyUSB0", 9600
							sp.write "abcd"
						

Ruby Serialport Gem

Arduino code

							int b = 0;

							void setup() {
							  Serial.begin(9600);
							}

							void loop() {
							  if (Serial.available() > 0) {
							    b = Serial.read();

							    Serial.print("I received: ");
							    Serial.println(b, DEC);
							  }
							}
						

Protocol

1 2 3 4 5 6 7
* => 1
. => 1 plus 1/2
_ => 1/2
- => 2
跑得快 => 3*4*5-

Protocol

Ruby Code

							require 'rubygems'
							require 'serialport'

							sp = SerialPort.new "/dev/ttyUSB0", 9600
							string = "12311231345-345-5.6_5.4_315.6_5.4_31151-151-0"
							string.scan(/\d[_|\-|\.]?/) do |i|
							  sp.write i.ljust(2, '*')
							end
						

Protocol

Arduino Code

						    c = Serial.read();
						    if (c == '-') {   
						      delay(1600);
						    } else if (c == '.') {
						      delay(600);    
						    } else if (c == '*') {
						      delay(400);      
						    } else if (c == '_') {
						      delay(200);
						    } else if (c == '0') {
						      noTone(8);
						    } else {
						      tone(8, pitches[c - '0']);
						    }
						

Firmata

• Firmata is a generic protocol for communicating with microcontrollers from software on a host computer
• Arduino StandardFirmata example code
• Ruby Firmata: https://github.com/shokai/arduino_firmata

LM35 Temperatur Sensor

Sinatra + Arduino

							require 'rubygems'
							require 'sinatra'
							require 'arduino_firmata'

							arduino = ArduinoFirmata.connect

							get '/' do
							  analog = arduino.analog_read(0)
							  temperature = analog * 100 * 5.0 / 1023
							  "Now Temperature: #{temperature.round(2)}"
							end
						

Personal Weather Station

• MG811 CO2 Sensor
  
• DSM501A Dust Sensor
  
• 

Control Electric

With Infrared Ray

Control Electric

With Infrared Ray

							require 'rubygems'
							require 'sinatra'
							require 'serialport'

							sp = SerialPort.new "/dev/ttyUSB0", 9600

							get '/switch' do
							  sp.write("1")
							  "<a href='/switch'>switch</a>"
							end
						

Control Electric

With Relay

• Queryable state
• Reliable
• Inexpensive

Continuous Integration

Using Lava Lamps for Continuous Integration

Tweet-a-Pot

Twitter Enabled Coffee Pot

Mini PC

Raspberry pi

Mini PC

Ubuntu on MK802

Trying...