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The simplest way, as @jsotola has said, is to put a resistor across the terminals of the SPST push-button and read the voltage using an ADC input of the MCU. However, the resistor needs to be bonded to the push-button (or inside the push-button housing) to ensure that when, for example, a vandal rips the push-button out of your switchboard, the resistor is ...

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