Ruby reading Arduino over serial port

The purpose of this code is for an Arduino to print over the serial port to a linux machine. A ruby script running on the linux machine will print out what it receives over the serial port.

Much of the code has come from the following:

• http://www.arduino.cc/playground/Interfacing/LinuxTTY
• http://www.arduino.cc/playground/Interfacing/Ruby

You will need:

• A linux machine with Ruby and Rubygems installed
• An arduino and a USB cable

Setup

Install the ruby gem serialport (you may need sudo)

gem install serialport

Setup the serial port (may need sudo here as well)

stty -F /dev/ttyUSB0 cs8 9600 ignbrk -brkint -icrnl -imaxbel -opost -onlcr -isig -icanon -iexten -echo -echoe -echok -echoctl -echoke noflsh -ixon -crtscts

Test the Serial port with 'cat' (quit by hitting -c)

cat /dev/ttyUSB0

Run the code

Run the code (may need sudo)

ruby arduino.rb

You should see the words 'High' and 'Low' printing in the terminal

Stop the script using ^c