The arduino mega gem inherits its functiality from the arduino gem.
Here's a simple example of an LED on pin 13 flashing for a second:
require 'arduino_mega' am = ArduinoMega.new("/dev/ttyUSB0") am.p13h = true sleep(1) am.p13h = false am.close
Here's th e same example except in block form:
require 'arduino_mega' ArduinoMega.new "/dev/ttyUSB0" do |x| x.p13h = true sleep(1) x.p13h = false end
The block form is safer since it automatically closes the serial stream when the block has ended.