As with every project, more and more features kept creeping in, battery gauges, OLED screens and big processors were thrown at it, until it was near collapse.

My first draft used a ATTiny85 and just the bare minimum, in the end there was a ATMega32U4 with build in USB, a OLED display, a battery gauge, multiple status LEDs, a rotary encoder and I2C temperature sensors.

The only feature that i regret axing is the USB bootloader but i could not settle on a simple way to make this possible,

From here everything had to be scaled way back, here are a few pictures of one of the later electronics prototypes that never were build: http://imgur.com/a/KjDoa