Hi, I m trying to use the HC-SR04 with the PIC16F877A to mesure the altitude of my plane from the ground I connected the Vcc pin of HC-SR04 to +5V (coming form the voltage regulator KIA7805A), the GND pin to the ground pin of the voltage regulator, the trig pin to PIN A0 of PIC16F877A, the echo pi…

Ultrasonic range sensor HC-SR04 using PIC16F877A

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