Our earlier articles covered how a matrix keypad works and walked through its Keypad.h reading code; this project puts both to use in a small…
Getting to know membrane keypad types and the matrix principle that saves wiring pins with Arduino.
Build a countdown timer with hours, minutes, and seconds set via a keypad and shown on an LCD, with an audible alert when time runs out.
Build an electronic door lock system that verifies a passcode via keypad and drives a servo motor to lock and unlock.
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