Arduino RGB Led Controller


Introduction: Arduino RGB Led Controller

i recently got an arduino and the first project i tried was oomlouts instructable. there was to much work to do on the code so i made a simpler one.

Step 1: Parts

for the parts you will need
a common cathode rgb led
3 270-330 ohm resistors
an arduino der

if you have a common anode instead
you will need
3 NPN transistors
3 1k resistors

Step 2: Setup

this is how you setup your led for common cathode of you have the other type go to step 3

red pin to resistor to pin 9
green pin to resistor to pin 10
blue pin to resitor to pin 11
longest pin to ground

DI is blue pin

D2 is green pin

D3 is red pin

Step 3: Common Anode Rgb

this step is for the common anode people
r4-6 1k
1-3 270-330 ohm

u1-3 npn transistor

D1 blue pin

D2 green pin

D3 red pin

ignore the pin 1-3 signs it is just the pin 9 10 11 signs that are for arduino

Step 4: Programing

here is the code for it

it is since to edit the code to make the different colour combinations
using a colour code chart or random colours

Step 5: Enjoy

i hope you liked my instructable



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    I have been looking for a way to do this but to safely use my arduino to control the RGB lighting in my room with the 12V 3A power supply without burning out my arduino and using the PWM for the control. Do you have any advice?

    2 replies

    Try connecting it to a optoisolator or transistor. with the arduino on one side and 12V 3A on the other.

    I cld be mistaken but isn't the Arduino capable of sinking the LED current and therefore you wld not really need the transistors?

    1 reply

    Its for say driving more than 1 rgb led


    Shouldn't be better to use a led driver for an rgb led with different voltages for every channel? Someone said using resistors is not safe for the led lifetime.

    3 replies

    works fine with with me though i wanted to keep it cheap

    Is the diagram correct for the direction of the diodes? It looks like the triangles are facing the wrong direction.

    Yes the dirgram for the diodes is wrong reverse them

    isnt this a picture of a common anode?

    The code isn't downloading as the correct file, everytime I try to run it out the folder it won't open.

    1 reply

    click save target as then click save type as the add .pde to the end

    you right click and click save target or save target as.

    .PDE is for arduino IDE

    1 reply

    or you click the file and copy the code to arduino IDE

    a duemilanove with, looks to be, 328.