The main PCB holds an Arduino Pro Micro, two buttons and a total of six individual LEDs. (The upper two are controlled as two sets of four and the lower two are four pairs of two vertically).
The PCB is basically just an I2C-Interface for external sensors. I've used an MPU6050 as such, but I made it to be experimented with, so be creative.
Files
main.ino
Arduino source code. This is subject of change, visit my github for the latest version.