The idea for this project began in an open source hardware community I participate in, called Franzininho, in Brazil. We decided to have a Christmas project/challenge and the goal was to make a Christmas themed PCB using the WCH CH32V003 MCU (famously known as the "10 cent MCU" - 0,10 USD cost), a CR2032 battery and explore the microcontroller features. I decided to create this PC that, when assembled, is not flat, but makes a 3D Christmas tree and 16 5mm LEDs make for the balls on the tree. By doing this project, I learned a lot about this new MCU, C embedded programming in general, and using its low power modes to save energy. The board has a button that wakes up the MCU and starts a set of 4 animations for the LEDs. After a number of cycles of each animation, the board enters standby mode. The expected life of battery in standby mode is 2.5 years, so a new battery should last until the Christmas of 2025 if the ornament is turned on sparingly.