M5Stack RCWL-9620 Ultrasonic Distance Unit I/O - 2cm-450cm Range, 16mm Probe

The module's datasheet typically indicates a 3.3V or 5V logic-compatible operation for the GPIO interface. You must provide the appropriate VCC voltage (commonly 3.3V or 5V) as specified for your specific M5Stack host device or microcontroller. Always verify the voltage requirements with your controller's I/O levels to ensure proper communication and avoid damage.

Connect the module's VCC and GND pins to your board's power and ground. The digital output (TRIG/ECHO or dedicated GPIO) pin should be connected to a digital I/O pin on your microcontroller. You will need to implement a simple timing routine to trigger a measurement pulse and read the echo duration or the pre-calculated distance value provided by the RCWL-9620 chip, depending on its specific communication protocol.

The sensor has a 60° beam angle. This wide cone means it detects objects within a broad area in front of the probe, not just directly ahead. For precise targeting, ensure the object is the primary reflector within this cone. Avoid placing the sensor near walls or other surfaces that could cause false echoes from the beam's sides.

The RCWL-9620 chip is factory-calibrated, and its built-in temperature compensation provides stable readings. For most applications, no user calibration is needed. However, for maximum accuracy in critical applications, you can perform a one-point offset calibration against a known reference distance in your specific installation environment.

The module features a protective housing, but it is not specified with an IP rating for waterproofing. The ultrasonic transducer membrane can be affected by water droplets or condensation. It is best suited for indoor or protected outdoor use. For exposed or wet conditions, consider additional environmental sealing or a sensor specifically rated for such environments.