LED Sign

Description: Python fork of Ruby code: https://github.com/pshved/muni-led-sign/

LED Sign: http://www.brightledsigns.com/products/4_x16_LED_Mini_Desk_Sign-12972-0.html

Install

Ubuntu 12.04

• sudo apt-get install python-numpy -y
• (echo y;echo o conf prerequisites_policy follow;echo o conf commit) | sudo cpanm Device::MiniLED

Raspberry Pi - Raspbian (release 2014-01-07)

• sudo apt-get install python-numpy -y
• (echo y;echo o conf prerequisites_policy follow;echo o conf commit) | sudo cpanm --dev --verbose Device::MiniLED
• Seems that cpanm on Raspbian isn't updated on stable, so we have to pull into dev & issue a verbose

Usage

• Entry point is client.py
• Quick bootstrap script to test LED sign: python test.py
  • Assumes LED sign is located at /dev/ttyUSB0 (edit in lowlevel.pl, if different)

Major File Descriptions:

• lowlevel.pl — Perl wrapper for Perl API interaction with the LED sign made available via the CPAN module: Device::MiniLED.
• glyphs/*.simpleglyphs — Collection of custom font glyphs that allows for the composition of individual ASCII characters using binary data to turn on / off a specific LED.
• simplefont.py — Loads the custom font glyphs from font/*.simpleglyphs and renders the multiline text. It achieves the rendering by creating a single 16x96 matrix comprised of concatenated character glyphs for each character in the supplied strings for each of the top and bottom line of the LED sign.
• sign.py — Retrieves the rendering of the strings from lib/simplefont.rb and supplies it to lowlevel.pl API wrapper to write out to the sign.