Launchpad RGB Lamp

A simple RGB colour changing lamp on the TI Launchpad. Using one RGB LED, 3 resistors and a potentiometer.

Eagle files and mspgcc sources below.

Here’s the breadboard and Launchpad version:

(On my RGB LED, pin 2 is longer than the rest, it’s the cathode)

Prototype PCB:

I brought out GND, TEST, RESET and VCC to a 4 pin header, so I can use the Launchpad to do In-System-Programming and debug.

I’d like to mount it inside a small plastic bottle to help diffuse the light. But, a jam jar will do for now:

Source code and Eagle files: lamp.tar.gz

Turning the potentiometer moves smoothly through hues. The colours are always fully saturated. To show different RGB values, set led_brightness[0 to 3].

Download source code, makefile and Eagle project.

Bits of code cobbled from:
http://www.nunosantos.net/?p=114

http://www.msp430launchpad.com/2010/09/simple-adc-example-on-launchpad.html

Categories: Uncategorized.

Tags: lamp, launchpad, msp430

By jrt

— September 30, 2010 at 11:00 pm

Comment Feed

12 Responses

Hello…
i examined your blog and i liked it.
i want to use your project details in our msp430 blog.
can i use ?

mahir — October 15, 2010 @ 8:23 am
Of course, can you post a link to your msp430 blog here too.

Thanks.

jrt — October 15, 2010 @ 9:10 am
Hey is there a reason why you used P1.0 P1.1 P1.2?
I would use P1.0 P1.4 P1.4 so you can use P1.1 and P1.2 for Serial conection to PC or any other device to controll the colour…

MystBoy — November 3, 2010 @ 3:08 pm
@MystBoy It wouldn’t be hard to change the pins. I didn’t want a serial connection for my lamp, so started connecting from the first pin on the first port.

jrt — November 3, 2010 @ 3:12 pm
I know it may seem silly or trollish, but what is the value of the potentiometer?

Richard — November 9, 2010 @ 7:01 am
@Richard I used a 10K linear pot

jrt — November 9, 2010 @ 10:22 am
Wonderful! I may throw one together to play!!

FYI - you have an apparent error on your hand drawn schematic. P1.7 is on pin 9 rather than 8, i.e. one more pin “up” on the chip.

Thank you so much for sharing!!

Mark — January 23, 2011 @ 6:04 am
Nice Post, thanks
Just wish to know, how much current can each port (e.g. P1.0, P1.2) source safely?

Is this similar in all msp430 mcu’s?
Thanks

Bc — March 3, 2011 @ 2:18 pm
I was wondering if you could put the code up in a different format please

Tom — March 23, 2011 @ 11:43 pm
Hi, Great job
I need to do something very close to it, but I need to feed 20 LEDs. I was wondering to use all of them in series and then feed with 3 transistor which are going to be controlled by the MSP. Is this a PWM code ? could you please send me the code , I cannot find and did not understand the code in the link , is that the code you used ? or you modified it ?
Thanks

marcelo — April 7, 2011 @ 5:20 pm
what is the value of resistor?
270 ohm or 270k which one?

kralex — May 11, 2011 @ 8:14 am
@kralex 270

jrt — May 11, 2011 @ 9:05 am