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View Full Version : June 2010 Circuit Cellar: Chris Cantrell prop article



Fred Hawkins
06-02-2010, 12:30 AM
I hope I am not duplicating here --

Cantrell's article leads out the June 2010 Circuit Cellar·issue #239, so "on sale at·magazine racks everywhere·now"


"The design reads movie frames from an SD card and displays them
on a 48x32 LED display while generating music with six independent voices"


Uses two AY38910 chips for the sound gereration.

Uses two inverter chips to boost prop's 3.3v to 5v for the LED display. (7404 TTL inverter gates)

LED display built from 4 DE-DP016 boards from Sure Electronics. (24x16 LED matrix) Features a "serial SPI-like commands". Requires 5v supply

Sets up an interpreter to manage a sound/sight interface.

Uses Rokicki's SD work from object exchange. Reworked to fit in a single cog.

Al Booth
06-02-2010, 12:38 AM
Already mentioned, see

http://forums.parallax.com/showthread.php?p=910425