monochron dcf77 001-a.jpg
Datum 30.10.2010
Inside the Monochron Clock - all pins are available and there is an extra space for hacking purpose. To connect the DFC77 receiver 3 wires are needed. GND, AREF and a signal wire to pin PC1.
monochron dcf77 004-a.jpg
Datum 30.10.2010
This DCF77 receiver module is from nixieclocks.de. The kit costs 30 € in their webshop.
monochron dcf77 009.jpg
Datum 30.10.2010
To do a quick test, I hooked alligator clips to the wires and the plug.
monochron dcf77 011.jpg
Datum 30.10.2010
Unfortunately the first test did not work. The module delivers an inverted signal, so I had to change the sourcecode a little. After that, all went good.
monochron dcf77 013.jpg
Datum 30.10.2010
Here you can see the bits scrolling from right to left.
monochron dcf77 015.jpg
Datum 30.10.2010
The receiver module has a LED to show the received bits. It blinks every second.
monochron dcf77 016.jpg
Datum 30.10.2010
After receiving a full minute without errors.
monochron dcf77 019.jpg
Datum 30.10.2010
Next step - use this receiver module from Pollin.
monochron dcf77 022.jpg
Datum 30.10.2010
Unfortunately this module needs to switch on by grounding the PON pin after powering on. This is done with one resistor and one capacitor.
monochron dcf77 024.jpg
Datum 30.10.2010
Mounting holes for the antenna.
monochron dcf77 025.jpg
Datum 30.10.2010
Mounted antenna. Fixed by zipties.
monochron dcf77 026.jpg
Datum 30.10.2010
monochron dcf77 027.jpg
Datum 30.10.2010
All together.
monochron dcf77 028.jpg
Datum 30.10.2010
monochron dcf77 029.jpg
Datum 30.10.2010
monochron dcf77 031.jpg
Datum 30.10.2010
Unfortunately I got no radio signal with the antenna inside the case. So I had to move it out.
monochron dcf77 032.jpg
Datum 30.10.2010
Hanging around antenna.
monochron dcf77 033.jpg
Datum 30.10.2010
Hanging around antenna, receiving.