Quantity   Component name
12 × ws2812B addressable leds
1 × Atmega328PU TQFP AKA arduino
1 × DS1302 RTC RTC that works at 2V
1 × 32.768 khz crystal for timekeeping
1 × Selector switch
1 × 3.7V 110mAh battery any battery small enough will do
1 × Arduino duemilanove or uno for programming the blank avr
1 × JST terminal for the batery
1 × hydrogen peroxide half of my prefered etchant
1 × hydrochloric acid, AKA muriatic acid this is actually a pool supply, and the other half of my prefered etchant
1 × sheet of double sided copper clad pcb
1 × laser printer
1 × cheap off-brand purple stick glue name brand works too well, get the cheap crap!
1 × emergency eye wash seriously though
2 × gloves
1 × eye protection