Tweaking the code

md — Wed, 18 Apr 2007 14:54:47 +0000

Thanks to Lasse Lambrecht, I can release a new version of the DCF77 code – now you can run it on the ATMega168-based Arduinos.

The ATMega8 differs slightly from the ATMega48/88/168-series: The latter chips have an extended Timer2-hardware and therefore need different initializations. Lasse send me a nice adjustment of the code, basically he uses preprocessor flags to figure out which initialization commands to use: #ifdef ATMEGA168 TCCR2B |= (1<

arduino-dcf77-clock-0.2.1.tar.bz

For the hardware setup, please refer to my initial post.

Arduino DCF77 v0.2 released

md — Sat, 06 Jan 2007 22:52:15 +0000

The sketch for decoding the time radio signal DCF77 is greatly improved: I use interrupts for handling the signal and a backup timer has been added.

Note that there is no interface at the moment, the time is simply put to the serial line. But it should be easy to add a display to show the time. The sketch eats roughly 6000 bytes of memory – if you want to add a user interface, you should consider buying a 16 kb Arduino ;-)

Of course, you also need the DCF77 receiver module and a pullup-resistor, as described in my old post.

You can download the code here:

arduino-dcf77-clock-0.2.0.tar.bz

BTW: The picture above shows a Nixie tube clock. I ripped the picture shamelessly from flickr, there’s a photostream showing the creation of the clock. Cool project.

gonium.net » clock

Tweaking the code

Arduino DCF77 v0.2 released