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Hi Friends! I hope you are doing well. Welcome you onboard. Today, I'll discuss the basic Introduction to HC-SR04 Ultrasonic Sensor . It is an ultrasonic sensor, also known as an ultrasonic transducer that is based on a transmitter and receiver and mainly used to determine the distance from the target object. Libraries HC-SR04 Simulation Libraries Latest library: Ultrasonic Sensor Library for Proteus V2.0 (October 2026): HC-SR04 with real TRIG and ECHO timing, Simple and Advance devices, test tools and an Arduino demo Other distance and motion sensors: JSN-SR04T · Sharp IR · TF-Luna LiDAR · VL53L0X · PIR HC-SR501 · RCWL-0516 · IR Obstacle FC-51 Helping Tools Serial Monitor Advance : a serial terminal window for the UART of your board Serial Monitor Expert : the serial monitor with extra de ...