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MOVING_LIGHT_DISPLAY

2016-12-01 10:02  
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MOVING_LIGHT_DISPLAY
Computer-controlled blinking of LEDs arranged in circle or other pattern gives illusion of motion. One section of quad 7475 latch is assigned to each of several output ports of microprocessor. Decoding logic of output port determines when latch is addressed for output. Decoded WRITE signal latches data presented at bus receivers. lnterface can be extended to many registers in groups of eight, limited only by input/output addressing capability and power available for LEDs. Software is written to turn on LEDs in desired sequence and provide desired variable delays between blinks.-C. Helmers, There's More to Blinking Lights than Meets the Eye, BYTE, Jan. 1976, p 52-54.