PiWire

PiWire is a ruby wrapper around the wiringPi C library.

Installation

PiWire requires the wiringPi library be installed to work, make sure you have succesfully installed wiringPi before trying to install PiWire.

Add this line to your application's Gemfile:

gem 'pi_wire'

And then execute:

$ bundle

Or install it yourself as:

$ gem install pi_wire

As with wiringPi you must initialize PiWire before you start using it.

PiWire.init

If you don't do this then at best things wont work, and at worst your program will crash.

You can have PiWire auto initialized by requing pi_wire/init instead.

This is effectively the hello world program of electronics:

require 'pi_wire/init'

pin = PiWire::OutputPin.new(1)

loop do
  pin.toggle!
  sleep 0.5
end

A new output pin can be created, specifiying the wiringPi pin number to use:

pin = PiWire::OutputPin.new(0)

You can now read and write from this pin:

pin.read # will return PiWire::LOW (0) or PiWire::HIGH (1)
pin.write PiWire::HIGH

A new PWM pin can be created, this will use pin number 1 by default.

pin = PiWire::PWMPin.new

You can write to this pin, by default the range is from 0 to 1023

pin.write 512

Run the tests with rake, these must be run as a superuser.