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How do I detect a button press between MCU loop function calls?

One solution is to use an interrupt; connect all buttons to the same interrupt pin on the MCU, which triggers the code to poll the shift register. Thanks to @Andyaka in the comments for this idea. ...
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1 vote

Shift register does not output voltage

Do some methodical debugging. You'll need to figure out if it's a hardware problem or a software problem. Hardware: Are the shift register outputs giving the expected high / low output signals. If so,...
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Driving Relay Board with Shift Register (Shift vs Sink)

you can use 595 followed by A2982 for example.
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