HC sr 04 ultrasonic sensor

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The HC-SR04 Ultrasonic (US) sensor is a 4-pin device, with pins named Vcc, Trigger, Echo, and Ground. This widely used sensor measures distance or detects objects in numerous applications. The module features two "eye-like" projections that function as an Ultrasonic transmitter and receiver. It operates on the basic high school principle: Distance = Speed × Time. When activated, the ultrasonic transmitter sends a wave through the air; upon hitting any material, the wave reflects back to the sensor, which is then detected by the Ultrasonic receiver, as depicted in the images.