A very basic object detection and alarm system using Arduino
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Dejan Nedelkovski from HowToMechatronics illustrates the use of HC-SR04 ultrasonic distance sensor in object detection, and its application for making a very basic password-protected Arduino-based security/alarm system. The project uses an Arduino board, character LCD display, 4×4 keypad,HC-SR04 ultrasonic sensor and buzzer.
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