Instructables
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Picture of Arduino RGB LED control
On the internet there are lot of instructions about connecting RGB LEDs and Arduino but nothing about controlling brightness except connecting potentiometer to every LEDs input but what when you don't have enough potentiometers? Then this instructables will help you.

 
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Step 1: Parts list

Picture of Parts list
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You will need:
arduino board
10KΩ potentiometer
button
breadboard
10KΩresistor
RGB LED module (if you don't have RGB LED module but only RGB LED you will need to connect 330Ω resistors to led)

Step 2: How to connect

Picture of How to connect
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Step 3: Code

With potentiometer you can adjust brightness of actual color and with button you change color.

Sorry for my bad english.