piano cube light painting


I recently finished a painting with light emanating from it using an atmega328 with arduino bootloader.

i used 12v leds with some tip120s to switch them on and off. it's a real bird's nest behind the painting. hopefully nothing will get set on fire :slight_smile: I used really big resistors (3W) but they still get very hot.
Here' s more info on my blog: jeremy c.

Thanks so much! I couldn't make stuff like this without the forums here!!!

Very interesting ! You should post the youtube URL here too! (

You should recalculate the value of the resistors if they are getting that hot. Post some schematics for a review??

PS, next step is to make the piano keys touch sensitive in your painting :slight_smile:

Thanks! Here's the youtube url: - YouTube

i made a painting with key sensitivity awhile ago :slight_smile:

the Vf of the leds is 3.4 and they are 300mA...according to this (http://led.linear1.org/1led.wiz) led calculator...i needed 33Ohm, 3W resisitors (huge ones!)
the schematics are pretty simple...just 9 tip120s, each one controlling 5 LEDs...3 pots...each one controlling 3 tip120s...