In SX Microcontrollers, SX/B Compiler and SX-Key Tool, _BPM_ wrote:

With that many inputs, you might want to think about using a few Parallel in - Synchronous Serial out chip... AKA the 74hc597,  This method, you can latch all inputs at once, and shift them all into your microcontroller using only 3 pins on your microcontroller.'

Just another way to go about your idea...

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