about.txt

AVR单片机有趣的展示

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Funny AVR demonstration. Controls 8 LEDs which are directly
connected to VCC. Additional to the nice illumination this
program demonstrates the usage of the async timer and the
sleep modes to save power.


The port pins for the LEDs are in a way selected, that it is
easy to put these around the chip. If you want to change the
port pins (maybe for another mcu), simply change it in the file
hardware.h. It doesn't matter which port pins you select. You
can control the brightness by changing the values in the section
Timings in globals.h.

Additional to the LEDs you can connect 2 keys to the mcu. The
function of the keys is either to select the mode of illumination
and to switch it on and off. If you hold the mode-key for about
1,5 seconds an auto mode will be selected. In this mode all
illumination effects are automatic periodically selected.
The shutdown is realised through the power down mode of the mcu.
While the program is running, the power save mode is used to
reduce the power assumption.

The build_*.* files are usefull for calculating build numbers,
but it is written for win2k. I didn't try it on other win os's.
And it didn't work on other OS I assume.

To the hardware:
Connect the LEDs to the pins which are defined in hardware.h, the
same for the keys. No external pull-ups are required. But you need
a 32.768KHz oscillator on the TOSC1 and TOSC2 pins.

Compiled with WinAVR January 2003 distribution. You need avr-sizex
too. You find it here:
Otherwise you can delete the sizex usage in the makefile.

Inlcuded are the schematic and an example for a board (not verified ;-)

Have fun
Volkmar 


------------------ by armok 2004-10-06 www.OurAVR.com ----------------------------