AVR 7-segment clock
This is my first small project I made with an AVR-controller.
The clocks heartbeat is a jitterfree, clock accurate frequency divider.
Unfortunatly I've choosen a resonator as clock source, so that the clock runs to fast.
After ajusting the divider value the error of about 1 second a day was acceptable.
The circuit can be viewed in every electronic book. Some 7-segments and LED's
arranged as a matrix in rows and colums and a multiplex routine written in assembler.
The two buttons are for setting the time.
schematic (drawn with gschem)
download (asm-sources and schematic)
The license is public domain, so do whatever you want.
This package comes with no warranty.
Source-Code and schematic: avrclock.tar.gz
download (C-source and part values)
I have some C-source code for the clock, too: clockc.tar.gz
And sometimes I get questions about the part values of the clock. Here's a schematic with values in it:
Have you build a clock based on that page? Let me know, I'd like to see a picture.
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created with quanta 3.1, werner.ho(AT)gmx.de 2005-07-02