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The HC-SR04 is a 5V ultrasonic distance-sensing module for Arduino-compatible controllers, robots and non-contact measurement projects. It sends an ultrasonic pulse and measures the returning echo time to estimate the distance to a target.
Target shape, angle, distance and surface material can affect the returned echo. Soft or angled materials may produce weak reflections, so calibrate and test the sensor in its final mounting position. The Echo pin is a 5V logic signal; use suitable level shifting or a resistor divider with a 3.3V controller.
For a compatible controller and mounting setup, see the Arduino UNO R3 with cable and the HC-SR04 sensor bracket.
Explore more distance and proximity sensors from Robonation Pakistan. For timing-code guidance, review the Arduino pulseIn reference.
The commonly listed measurement range is approximately 2cm to 400cm, although target material, angle and environmental conditions affect results.
The module is designed for a 5V supply. Its Echo output is also a 5V logic signal, so a level divider is recommended for 3.3V controllers.
A controller sends a short Trigger pulse and measures the Echo pulse duration. Distance is calculated from the sound travel time.
Soft, small, angled or irregular surfaces may return a weaker echo than a flat, rigid target. Test the sensor with the intended target and mounting angle.
It is commonly used for robot obstacle detection, non-contact distance experiments, educational measurement projects and prototype proximity alarms.
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