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1 to 8 digit, 7-segment LED display
The theory behind this design is to scan all digits with only one digit being lit at a time. If this is done quickly enough, the display will appear to have all digits lit at the same time. This design has been tested and does work. Try this example code to use with the BASIC STAMP II microcontroller. This design can support anywhere from 1 to 8 digits simply by adding a PNP transistor and a 1k resistor from the output of the 74LS138 to ground of the digit.
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IC1 = CD4511 (BCD to
7 segment decoder)