If you’re not familiar with the 555 timer, suffice it to say that this versatile ... One of two comparators fires when the voltage on the TRIGger pin is less than the lower reference or that ...
[R-B] designed a 555 timer circuit to scan a keypad ... [R-B’s] setup allows you to reduce the number of pins used on the microcontroller to just two. One is an interrupt that is triggered ...
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