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Homemade Radio Electronics
DCF77 Monitor, rx module, pic16, LCD Display, serial output
Here bit48 is 92mS long, the 005 means that the last 5 recieved minutes was with perfect checksum
I used a good old test kit I had handy, it contained a 2402 LCD display and a PIC on a PCB
it is the same PCB as I used in my homemade wattmeter project
I have made the software so a cheap 1602 display can be used for the monitoring.
Parts used:
Conrad DCF77 RX module BN 641138
10K pull up from pin4 output to pin2 power, pin1 is ground.
1uF decoubling on the DCF77 digital data, helped.
PIC16F876 at 4MHz and a 1602 standard LCD display.
The DCF77 decoding is straight forward, but I have added some extra security,
The serial set string will be transmitted if 3 (or maybe 5) following minutes are with perfect checksum,
and their minutes are in sequence, while all other data are stable, this will prevent crap data to screw up the time on my loved nixie clocks.
Schematic : Later
Software : Later
This is still under development, so hang on.
Okt. 2004.