This simple nightlight is based on a WS2182. It’s driven by a Trinket Pro 5V (Hackaday edition of course) using the Adafruit NeoPixel library. It’s housed in a cheap dome light and is using the original batteries and resistor.
Adafruit Trinket – Mini Microcontroller – 5V Logic: Trinket may be small, but do not be fooled by its size! It’s a tiny microcontroller board, built around the Atmel ATtiny85, a little chip with a lot of power. We wanted to design a microcontroller board that was small enough to fit into any project, and low cost enough to use without hesitation. Perfect for when you don’t want to give up your expensive dev-board and you aren’t willing to take apart the project you worked so hard to design. It’s our lowest-cost arduino-IDE programmable board! Read more.