Quantity   Component name
1 × some sheets of plywood 5mm laser cut 7 segment stencil
1 × Wattuino ( or arduino mini ) <a target="_blank" rel="noopener noreferrer" href="http://www.watterott.com/de/Wattuino-pro-mini-5V-16MHz">http://www.watterott.com/de/Wattuino-pro-mini-5V-16MHz</a>
1 × RTC module <a target="_blank" rel="noopener noreferrer" href="http://www.watterott.com/de/Ultra-Low-Power-Real-Time-Clock-Modul-RTC">http://www.watterott.com/de/Ultra-Low-Power-Real-Time-Clock-Modul-RTC</a> for keeping the time
1 × Temperature sensor <a target="_blank" rel="noopener noreferrer" href="http://www.watterott.com/de/HDC1008-Breakout">http://www.watterott.com/de/HDC1008-Breakout</a> optional for temperature display
1 × 5V Power supply <a target="_blank" rel="noopener noreferrer" href="http://www.watterott.com/de/MEANWELL-Schaltnetzteile-RS-50-5">http://www.watterott.com/de/MEANWELL-Schaltnetzteile-RS-50-5</a>
28 × pieces of WS2812 stipes with 4 LED's each
4 × some pieces of sandwitch paper as diffusor