Controlling RGB Leds

Using Arduino LEDs and Multiplexing
15

Grumpy_Mike:
Then you are missing something big.
Their are four major types:-

  1. Four connections, one positive and one for each of the grounds for R,G and B. Normally these are 12V and are controlled by a PWM signal driving a FET in each colour line. This is how you use them Usage | RGB LED Strips | Adafruit Learning System. What ever is the colour all the LEDs on that strip have the same colour.

  2. Three connections 12V - Every three LEDs have full independent colour control.

  3. Three connections 5V - power ground and data, of the WS2812 type sometimes called Neopixels. Each LED has full independent colour control.

  4. Four connection 5V - power ground data clock, sometimes called dot star. Each LED has full independent colour control.
    Overview | Adafruit DotStar LEDs | Adafruit Learning System

I have never been to a supermarket in China so I don't know what they sell.

Perhaps you can point out the four types on eBay.
As I said, that's where I buy mine.