Physical Computing
with Ruby and Arduino
Matthew Williams
@mwilliams
Orlando Ruby Users Group

Barcamp Orlando Anyone?

What's Arduino?
http://www.arduino.cc

Arduino haz Flavor?

http://rad.rubyforge.org/
http://github.com/atduskgreg/rad/

Arduino
•14 Digital I/O (6 PWM)
•6 Analog In
•16kb Flash Memory
•2kb for boot loader
•16MHz Clock Speed
•Serial Communication
•USB Powered (or AC)
•I2C

Arduino IDE

RAD IDE

Ruby + Physical Computing
•Control an Arduino with Ruby
•RubyToC
•AVR­GCC
•Most of the Arduino API ported to
Ruby
•Additional libraries
•Serial communications
•Servos

Arduino Code
int ledPin = 13;
void setup() {
pinMode(ledPin, OUTPUT);
}
void loop() {
digitalWrite(ledPin, HIGH);
delay(1000);
digitalWrite(ledPin, LOW);
delay(1000);
}

RAD Code
class HelloWorld <
ArduinoSketch
output_pin 7, :as => :led
def loop
blink led, 1000
end
end

RAD Methods
•input_pin(s)
•output_pin(s)
•digitalWrite| digitalRead
•analogWrite | analogRead
•serial_print | serial_read
•Keeping it simple
•It's all about the hardware

Coming Soon
•Testing
•Arduino Simulator
•Better RubyToC Support
•More \"Out of the Box Support\"
•LCD's
•OLED Displays
•Motors

Arduino Shields
http://www.nycresistor.com/2008/04/21/zach­
smith­demos­his­danger­shield/

http://www.liquidware.com/projects/8/Pin+Visualizer

Buy an Arduino
http://www.sparkfun.com
http://ww.makezine.com
$34.95
(or cheaper)

Awesome Resources
•http://makezine.com/getstartedarduino/
•http://blog.makezine.com/archive/arduino/
•http://arduino.cc/playground

Barduino
http://github.com/mwilliams/barduino

The Barduino
•Arduino
•Breadboard + Wire
•Transistors
•Relays
•Windshield Washer Fluid Pumps
•~$60 Total?
•2 pumps, could handle 14+

Barduino­tender
http://github.com/mwilliams/barduino­tender

Barduino­tender Recipe
drink 'Screwdriver' do
serve_in 'Highball Glass'
ingredients do
2.ounces :vodka
5.ounces :orange_juice
end
end

Want More?
•RubyConf 2008
•Friday
•10:25 ­ 11:05
•Room 3
•Greg Borenstein
•(Big help with this demo)

Let's Serve Some Drinks
(and look at code)