How to Interface Ultrasonic Module HC-SR04 with 8051
Introduction Ultrasonic HC-SR04 Module The HC-SR04 ultrasonic module operates on the principles of SONAR and RADAR. This module features an ultrasonic transmitter, receiver, and control circuitry all integrated onto a single board. It has four pins: Vcc, Gnd, Trig, and Echo. When a pulse of 10µs or longer is sent to the Trig pin, the …
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