Tobi's Corner » PWM

IKEA Storm + powerRGB = G R E A T

theFloe — Fri, 05 Jan 2007 17:18:16 +0000

Here you can see my IKEA Storm Lamp Mod using the powerRGB circuit and the tinyRGB firmware.

First . Here are the steps:

Assemble the lamp but leave the paper shield down
Remove the contacts from the bulb’s holder:
Now open the holder
Build the powerRGB circuit on a PCB that fits the inner of th mounting:
Solder some power supply cables to the PCB and pull them though the mounting down to the lamps base and put the PCB into the holder:
So thats it. Now reassemble the lamp with shield and connect a propper power supply to the board.
The most important step: Re-Design the Box:
Here some Images under Day-Light conditions:
And when darkening the room:
Enjoy your FÃ„RGRANN

powerRGB

theFloe — Thu, 21 Dec 2006 11:51:29 +0000

powerRGB is the extension of tinyRGB to drive high power LED’s. For this project I used a 3 x 1W common Anode RGB LED.

Q1 to Q3 are N-Channel HEXFet Mosfet’s with logic level drive and a RDSon at about 50mOhms. R1 to R3 are at about 2k2, R4 to R6 at about 15k and R7 to R9 depend on the LED used and VCC. If you use FET’s with higher RDSon you have to consider RDS in your calculation!

Rx = (Vcc-Vf)/Im – RDSon

[Vcc: Volatge of power supply, Vf: Vorward Voltage of the Diode, Im: Max current of LED]

The software for the AVR is the same as for tinyRGB.

tinyRGB

theFloe — Sat, 11 Nov 2006 11:59:39 +0000

The easiest way to control a RGB Led.

tinyRGB uses an ATMEL Attiny15L (8pin uC) to control a standard RGB Led.

R1 is a pullup Resistor for Reset generation (should be about 10k).
R3 to R5 depend on the LED you are using. You can calculate the resistor as followed:

Rx = (Vcc-Vf)/Im

[Vcc: Volatge of power supply, Vf: Vorward Voltage of the Diode, Im: Max current of LED or AVR pin (20mA)]

If you want to control power LED’s read here: powerRGB.

The software is written in Assembler (avra under Linux, should be compatible to AVR Studio). Timer0 is used to generate interrupts at about 30kHz. This interrupts are used to build a 8bit PWM. Timer1 is used to change the color pattern.

Downloads:

tinyRGB Sourcecode and HEX File
NEW RGB LED – Sourcecode for ATTiny45 from Robert Ibener