![]() How Does HC-SR04 Ultrasonic Distance Sensor Work? GND should be connected to the ground of Arduino. ![]() The length of the pulse is proportional to the time it took for the transmitted signal to be detected. Trig (Trigger) pin is used to trigger the ultrasonic sound pulses.Įcho pin produces a pulse when the reflected signal is received. VCC is the power supply for HC-SR04 Ultrasonic distance sensor which we connect the 5V pin on the Arduino.
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