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What is Configuring 4-Digit Alarm Keypad about?

This document provides instructions for setting up a 4-digit alarm keypad using a microcontroller chip. The keypad must have separate connections for each key. One key is wired to terminal E to set the alarm. Four keys are wired to terminals A, B, C, and D to enter the code to turn it off. When the set key is pressed, a relay energizes and lights an LED. Entering the correct code sequence at A, B, C, D terminals turns the alarm off by grounding the relay. Any incorrect key press prevents the code from being

Author

srinimd2005

Language

EN