Forgot your password?


+ - Sprint Epic4G 3G upload speeds limited to 150kbps->

Submitted by Miamicanes
Link to Original Source
Christmas Cheer

+ - Networked RGB Christmas lights sync'ed to music->

Submitted by
Miamicanes writes "Ever want a string of Christmas lights made with RGB LEDs so all the lights can change colors? Or with their own microcontrollers, so each can act autonomously? Hell, why not go all the way, and network them while you're at it?

I did.

For the past 4 years, I've burned most of my Decembers, Novembers, and increasing chunks of October working on this project. This year, for the first time, they look like "normal" LED Christmas lights (I bought a few sets of clear LED lights on sale at Lowe's & removed the plastic diffusers from them to use on my own lights), and the controller I built last year finally works properly & reliably communicates with the lights.

Each light module has its own Atmel ATtiny25 microcontroller, linear power supply, RGB LED, and passive components. The whole thing is wired in parallel with just 3 wires... +12v, ground, and communication. One of my specific design goals was to keep the wires thin (AWG22 or smaller), which required higher supply voltage and individual power supplies for each module (not really a big deal... the regulator chip and 2 capacitors added about 50c to the cost of each light, and completely eliminated my original power problems).

The result? My favorite version of "Feliz Navidad" (recorded by Home Grown, an awesome SoCal punk band), accompanied by what's arguably one of the most sophisticated (and expensive) strings of Christmas lights in the world. Their own video (http://www.youtube.com/watch?v=MCLogsA2vMQ) is incredibly well made and hysterically funny, too! If Blink182 sang the song and made a video for it, it would ALMOST be as good as the one Home Grown made :-)

How expensive were the lights? I don't know. I've lost count. I've spent at least a kilobuck or two. If you assume my time is valueless, and you ignore the cost of the tools I've bought, the parts I've destroyed, and the crate of non-working light modules (roughly 3 or 4 for every working one that you see on the tree here), each light module has about $4-5 worth of parts (bought in hundred quantities from DigiKey and Futurlec). There are 36 on the tree today. Do the math. Then forget it, because it's too cool to care how expensive it was. Grossly over-engineered perhaps, but cool nonetheless."

Link to Original Source
