The clock is synchronised via the German time signal DCF77. It has a display with automatic brightness control and a RS232 computer interface. Arvin writes:
The clock is built around a PIC16F84 microcontroller from Microchip. I chose this microcontroller since its FLASH memory is easy to program and assembler and programmer software is freely available for GNU/Linux. It has 13 general input/output pins which is just enough to implement all the feature
A DCF77 Clock with RS232 Interface - [Link]
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