Ruby code snippets for Raspberry Pi peripherals from Adafruit

by Sungjin Han meinside@gmail.com

Description

Ruby scripts for various Raspberry Pi peripherals from Adafruit

Instructions

a. setup i2c

$ sudo modprobe i2c_dev

$ sudo vi /etc/modules

# Add following line:

i2c-dev

$ sudo vi /etc/modprobe.d/raspi-blacklist.conf

# Comment out following lines:

blacklist spi-bcm2708
blacklist i2c-bcm2708

$ sudo apt-get install i2c-tools

$ sudo usermod -a -G i2c USERNAME

b. Install gem

gem install raspi-adafruit-ruby

Examples

8x8 Matrix

require 'led/matrix8x8'

Adafruit::LED::Matrix8x8.new do |led|
  led.write_array([
    [0, 0, 1, 1, 1, 1, 0, 0],
    [0, 1, 0, 0, 0, 0, 1, 0],
    [1, 0, 1, 0, 0, 1, 0, 1],
    [1, 0, 1, 0, 0, 1, 0, 1],
    [1, 1, 0, 0, 0, 0, 1, 1],
    [1, 0, 1, 1, 1, 1, 0, 1],
    [0, 1, 0, 0, 0, 0, 1, 0],
    [0, 0, 1, 1, 1, 1, 0, 0],
  ])

  sleep 3

  led.clear
  sleep 3

  led.fill
end

Bicolor 8x8 Matrix

require 'led/bicolor_matrix8x8'

OFF     = 0
GREEN   = 1
RED     = 2
YELLOW  = 3

Adafruit::LED::BicolorMatrix8x8.new do|led|
  led.write_array([
    [RED, RED, GREEN, GREEN, YELLOW, YELLOW, OFF, GREEN],
    [RED, RED, GREEN, GREEN, YELLOW, YELLOW, OFF, GREEN],
    [RED, RED, GREEN, GREEN, YELLOW, YELLOW, OFF, GREEN],
    [RED, RED, GREEN, GREEN, YELLOW, YELLOW, OFF, GREEN],
    [RED, RED, GREEN, GREEN, YELLOW, YELLOW, OFF, GREEN],
    [RED, RED, GREEN, GREEN, YELLOW, YELLOW, OFF, GREEN],
    [RED, RED, GREEN, GREEN, YELLOW, YELLOW, OFF, GREEN],
    [RED, RED, GREEN, GREEN, YELLOW, YELLOW, OFF, GREEN]
  ])

  sleep 3

  led.clear
  sleep 3

  led.fill # red by default
  sleep 3

  led.fill GREEN
  sleep 3

  led.fill YELLOW
end

License

Copyright (c) 2012, Sungjin Han meinside@gmail.com All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
• Neither the name of meinside nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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