Button Encoder

221

03:03:35

Pro tip:  If you want to design a button matrix encoder, build one column first.

~ Design
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Convert 1-of-4 to 2 bits for latch input.  Separately, find pressed signal to load latch.  Ignore multi-push problem; if the user wants to be silly, it's not our problem. :3

Relies on the pressed signal having a longer propagation delay.  When I changed it to use one 4-input OR gate made out of diodes and a resistor, I had to add an R-C delay circuit.

published 7 years ago

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