A popular project among microcontroller aficionados is to build a radio-controlled clock. Tiny receiver boards are available, with a pre-adjusted ferrite antenna, that receive and demodulate the DCF77 ...

Here’s a sunrise alarm clock that keeps perfect time. It was designed and built by [Renaud Schleck] who also published a post detailing the process. As you can see, a series of white LEDs inside of ...

Based on an Atmel AVR microcontroller with 8kB flash, the LED clock uses a German time signal in the form of DCF77 Receiver as it was connected to an Ethernet network to serve as a NTP server while ...

Clocks that read time via received radio signals have several advantages over their Internet-connected, NTP-synchronised brethren. The radio signal is ubiquitous and available over a fairly large ...