After building a couple smaller RGB lamps, I decided I wanted to see how far I could take the concept. The control circuitry is basically the same, it's just a matter of using a beefier LED driver!
My finished lamp measures 30"x30" square and is 3.5" tall. It hangs 5.5" off the ceiling, and uses 9x 3W RGB LEDs controlled by a PIC 16F1829 microcontroller.
Originally the lamp had an attached control panel for color and speed adjustment. Then one day I found a perfect IR remote control with Power, R/G/B, and Up/Down buttons and even a built-in switchable backlight! I decided this would be a fun and functional addition so I wasted no time hacking the IR output signal and interfacing it to the controller.
The lamp starts out in white-light mode (like a normal ceiling light). At the press of a button, it switches to RGB Color Fading. From here, you can adjust the speed with the Up/Down buttons or even pause the color at any point in the RGB fading cycle.
Hopefully this instructable will give you some construction ideas or inspiration for your own large-scale RGB LED project!
Step 1: Parts List
Single-wall corrugated cardboard
Plastic sheet rock corner bead
Rivets and Riveting tool
White Paint (optional)
Qty 1 - PIC16F1829
Qty 1 - 16MHz TTL Oscillator
Qty 1 - IRM 8410 or GP3U10X IR Decoder
Qty 1 - 4.7k Ohm, 1/4W, Resistor
Qty 3 - 1k Ohm, 1/4W, Resistor
Qty 3 - TIP121 Darlington Transistor
Qty 9 - 3W RGB LEDs (1W per color) (Buy 'em on Ebay, search for "3W rgb led", ~$6/ea)
Qty 1 - Power supply(s) (See Step 3) (I used Part# 418-CFM60S300 30V 2A supply from Mouser for $34.25)
Qty 3 - Current Limiting Resistors (See Step 3)
GE AREM4000-X Executive Remote (Ebay)
Hot Glue Gun
Storage Oscilloscope (Optional, but VERY helpful!)