Dennis Myer is a faculty member at the Nova Scotia Community College in Halifax, Nova Scotia, Canada. He holds a BS in physics from Dalhousie University, Halifax, and a bachelor of engineering degree from the Technical University of Nova Scotia, Halifax. Email address: dennis.myer@nscc.ca
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November 17, 2008[Ideas For Design] Rotating LED Array Emulates Marquee-Type Display
I use this display circuit to expose students to the concepts and characteristics of scanning displays. Basically, a message is delivered to the CPU (a Microchip PIC16F76) over an RS-232 interface. The message is displayed on a vertical array of eight LEDs, which are spun by a dc motor. As they spin and take on new positions, the LEDs are updated with new lines of bit patterns, producing the display. In this way, the software allows the eight LEDs to emulate an 8-by-80...
