polski

the back side

• 1 - GPS receiver antenna


• 2 - bulb switch (switches on the bulb circuit through the relay)


• 3 - LED indicator


• 4 - summer / winter time switch


• 5 - clock synchronization button (via GPS signal)

key parts

• NodeMCU µcontroller


• 2 x 74hc595 shift registers to controll Nixie Drivers (74141/K155ID1)


• 4 x Nixie Drivers 74141/K155ID1


• Real Time Clock module (RTC)

making of

winter 2020/21