8x8 dual color LED matrix
1AVR Atmega 168 using 3 shiftregisters as I/O expansions - with 2 darlington driver arrays to drive a 24-pin bi-color 8x8 LED display. The difficult part now seems to be getting the timing of a full refresh in both colors fast enough to not notice flicker - all I need is 40 Hz. next step is to get images displaying, and then add a single output to measure the refresh frequency via externally.
This 8-bit micro only has 23 I/O pins, and using a shift register in this fashion leaves around 12 pins free for other features - such as a joystick, serial port debugging?
see another similar http://www.youtube.com/watch?v=43RZ77z1cuo
Source CODE: Source code: http://softcircuitry.blogspot.com/2010/04/embedded-blogs.html
Since comments are not working on Youtube for some people (behind a gateway) this link took a while to post.
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