For this project 56mm x 38mm Common cathode 7- Segments LED Display was used. As you can see it’s a very big display and can be an excellent choice for building a digital clock for example. Current design features only one 7-Segment, however the number of segments can be easily extended. Follow design schematic for more details.
Design assembly code is very similar to what was used in PCF8574 I2C 8-bit I/O expander post except for addition of BCD to 7-Segment routine and a simple binary counter. You should see a count from 0 to 9 with about 1s intervals if the circuit is functioning OK.
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