A keypad is a matrix of normally open switches. In applications, keypads are often connected to microprocessors. The microprocessor scans the keypad many times each second. When a button is pressed, the microprocessor reads the coded output.
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A keypad is a matrix of normally open switches. In applications, keypads are often connected to microprocessors. The microprocessor scans the keypad many times each second. When a button is pressed, the microprocessor reads the coded output.
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