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An Arduino project implementing a security alarm system featuring PIN code access via a 4x4 keypad, status updates on a 16x2 LCD, motion detection using an HC-SR04 ultrasonic sensor ... LCD contrast ...
This project implements a real-time people counting system using the 8051 microcontroller, dual ultrasonic sensors (HC-SR04 or similar), and an LCD1602 display. The system detects entry and exit ...
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