The LED Taillight is a resurrected taillight (yes, from a car) that has been outfitted with new LEDs and an ethernet Arduino. Users can cause the Taillight to blink again by sending messages to the Arduino's network server.
A blog post explaining the origin of the project is available here: http://blog.tophernet.com/2012/02/hardware-hackathon-arduino-led.html. If you're still confused, it even has pictures.
Our network server listens on 192.168.95.44:50001. Open a socket to that port to send messages to the Taillight.
Clients talking to our network control the LED status through a character stream message consisting of a four one-digit integers. Each integer represents the new mode for one of the LEDS.
1: Steady on
2: Blink slowly
3: Blink normal speed
4: Blink fast
For example, if I wished to pulse all the LEDs, I would send the message '5555'.
Turning on LEDs #0 and #1, pulsing #2, and turning off #3 would be '1150'.
v1.01: New network spec - one must send new modes for all LEDs with every message, instead of setting each one at a time.
v1.00: Initial release!
The source for this project is available on Github: https://github.com/topher200/led_taillight
Copyright Topher Brown email@example.com, 2012. Released under the MIT license.