Do you like bright shiny lights? Have you ever wished you could have bright shiny lights controlled by your smartphone? That is what this project was about. Clara wanted to add some mood lighting to decorate her bedroom and we figured it would be cool if she could change the lights to go with the desired mood.
We are using an Arduino micro controller with a bluetooth module. This allows us to drive LED-programmable lights (Neopixels) with a widely available library, and from the Arduino environment we have some experience in, while enjoying all the coolness of controlling from a smartphone app.
The folks at Adafruit made this project a lot easier and so we use their hardware primarily. It would probably be cheaper to use a Wemo-type device with Wifi. The ESP32 supports both Wifi and bluetooth and can be programmed in MicroPython instead of Arduino.
5v power comes into a barrel jack and is fed through a capacitor to smooth it out, to the Neopixel strip, to the Arduino, and to a logic level converter. Out of PIN 6 comes the signal that drives the Neopixels because this Arduino has 3.3v logic levels and Neopixels expect 5v logic levels.