I2C-Addressable RGB LEDs - Breadboard Prototype

A project I've been working on lately. It is inspired by the work of DIYChristmas member mrpackethead ( http://www.youtube.com/user/mrpackethead ), who has done something similar with off-the-shelf chips sourced from Asia. These ICs are difficult to source in the U.S., so I used an Atmel ATTiny85 AVR microcontroller instead. The code for these fits within the flash of a Tiny25. This video shows the early results of my project. There's still a long way to go, especially in terms of manufacturability research and whether I'll run into problems with a longer I2C bus length with 125 of these on it.

Visible in this video:
Two 10mm common anode RGB LEDs from Evil Mad Scientist Laboratories
Two Atmel ATTiny85s from Mouser
Support components (resistors, capacitors) for the above
A PJRC Teensy, which serves as a USB-to-I2C bridge. The Micropendous firmware running on it has some bugs that cause it to lock up if stressed, so my refresh rates in this video aren't what I'd like them to be. Eventually this will be replaced with a DMX512-to-I2C bridge based on an Atmel ATMega168.

Even with exposure settings cranked way down, the LEDs were too bright for the camera, so this video doesn't quite do them justice. They're both running a hue rotation, 180 degrees out of phase. Every 30 degrees of hue they dim to zero, blink fullbright, then ramp back up to their color.

The music is Power Ninja Action Challenge by Linus Akesson aka lft. It has no particular relation to the video content other than the fact that I like it and it was synthesized using an ATMega88.

My hope for this is to have a house to wire a bunch of these to for the 2010 holiday season.

More information on the development of this project is at http://doityourselfchristmas.com/forums/showthread.php?t=10157

Category:

Science & Technology

Tags:

• LED
• AVR
• I2C
• ATTiny85
• ATTiny25

[HowBoutDemBoyzz]

nice i want to learn how to do tht wat are all the IC chips u used? I have just started breadboarding and have done a lot with 555 timers and LEDs but i want to move on to more advanced projects.