View Full Version : DCF77 (Radio Controlled Clock) to BS2

05-01-2007, 06:40 PM
Does anyone know how to connect (and a sample program)·a serial DCF77 reciever to a BS2?

05-01-2007, 08:45 PM
Interesting idea TCPIP. Which receiver do you intend to use? I have some documentation
regarding projects that use the BN641138 (Conrad) DCF77 receiver.
Will have a look later today.

05-02-2007, 06:31 PM

I found a QBASIC (!) program which reads the data transmitted by the DCF77
receiver to the PC Centronics pin 32 (Fault input from printer to PC).

It shouldn't be too difficult to convert this support the interface between
the receiver and a BS2.

Will buy the transmitter in the next couple of days and let you know as I

For more info on the receiver, search for 641136 on the address:


Post Edited (Skywalker49) : 5/2/2007 12:19:04 PM GMT

05-02-2007, 07:49 PM
I've also found some program's and related webpages. Will have a look this evening and let you know.

I'm not intending to use the conrad reciever but it's very similar to the conrad one.

05-04-2007, 05:15 AM
DCF receiver ordered and will arrive after the weekend grrrrrr...
Hope to test it early next week.
The code I found and can be converted to BS code is rather simple.

Let's wait for the results.


05-04-2007, 06:57 PM
And I don't have time this weekend to play with the dcf-77 grrrrrr....

I've found this documantation/code:
DCF77 Decoder für BASIC Stamp I http://horst-lehner.mausnet.de/efaq/kapitel/Funktechnik.html
BASIC Stamp DCF-Clock http://www.agri-vision.nl/CMS/index.php?option=com_content&task=view&id=15&Itemid=50
Digitale DCF77 klok met LCD en gong http://www.picbasic.nl/frameload_nl.htm?http://www.picbasic.nl/dcf77_klok_nl.htm

Which code did you found?

05-04-2007, 07:55 PM
Here is the link to an article in Elektuur - Electronics monthly magazine in Dutch.

There is an English version the website http://www.elektor-electronics.co.uk but
I couldn't find the English version of the article.

The full article must be downloaded ( 1.30 Euro ) which I did.
I don't think I'm allowed to post it here (copyright ?).


Post Edited (Skywalker49) : 5/4/2007 2:09:28 PM GMT

05-08-2007, 03:36 AM
Still waiting to receive the hardware and start testing.
For those who are interested in radio station all over the word, check this out: http://en.wikipedia.org/wiki/DCF77

DCF77 is a transmitter in Germany Europe but this is not unique. There are similar radio station in Japan and US. See the overview on the first page.

Is there anybody who has used such a radio signal received and hooked it up to a BS ?

thx, Ed

06-06-2007, 03:23 PM
Finally I have the DCF77 receiver and some BS2 software working.
For those who are interested, here is some information:
To understand what DCF (Europe) or WWVB (US) is, have a look at the following links:

In this project the DCF receiver is connected directly to INPUT 0 of a BS2.
Use the regular output of the receiver, not the inverted one.
The receiver used is part number 641138 sold by Conrad.

Program "DCF77 listen to signal" displays (via debug) the raw received signal on your screen.
Compare the signal with the screen dump in file "DCF77 Clean Signal (debug output)".
Once you are sure that the received signal is in good shape, run "DCF77 decoder 2.0"
Read the comments in the program for a bit more details.

Next step to complete the project is hookup a DS1302 and initialize the RTC
with the date/time info collected by the DCF receiver.