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Easiest way to handle keypress with 1-bit option on memory restricted system

I'm looking for a simple way to handle key presses as well as store an option to allow a repeating key or just a one time press and release. Through experimentation,...
Detecting valid signals across multiple lines

I created a 4-channel sensor circuit with the following type of schematic because I want to keep my option of using the serial port of the 8051 to my advantage if...
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