I purchased a set of 4 NeoPixel ring segments and assembled them into a circle. I am trying to create a circular lamp that will be fitted inside a camper van in the ceiling and driven from a 12V battery.
I would like to add a dimmer switch to the lamp but my understanding is that I need to match the dimmer switch to the type of LED's that I am using.
How could I add a dimmer switch (and possibly a colour changer too) to a NeoPixel ring light?
(Note: the large neopixel ring that I have looks like this: 
Best Answer
Neopixels are not like normal LEDs, they require some sort of a computer to send the data to tell them what color and brightness to display.
Typically people do this with a small and cheap computer like an Arduino.
You can also control the NeoPixels using a normal computer and a board like the FadeCandy...
https://www.adafruit.com/product/1689
The FadeCandy connects to the computer over USB and then you run a program on the computer to tell the NeoPixels what color to display.
I have not seen a commercially available, stand alone NeoPixel controller- although it would not be hard to make one.
If you want to control your NeoPixel ring, I think you are going to have to dig in make your own controller!
Here is a very cheap and popular tiny-computer (called the Teensy) that is very popular for driving NeoPixels...
https://www.amazon.com/SparkFun-Teensy-3-1/dp/B00NC42Y64/ref=as_sl_pc_ss_til?tag=joshcom-20&linkCode=w01&linkId=WAVCBDPYGTR3YIZH&creativeASIN=B00NC42Y64
...but there are plenty of others.