MaxBotix MB7139 XL-TrashSonar-WR Ultrasonic Sensor Module - 0-350cm Range, IP67, 3-5.5V

The MB7139 provides three simultaneous output types: an analog voltage output proportional to distance, a pulse width output where the pulse length corresponds to range, and an RS232 serial output transmitting ASCII characters. You can use any or all outputs concurrently; simply connect to the corresponding pins on the 5-pin connector. The sensor does not require configuration to enable a specific output mode.

The sensor's firmware continuously performs background automatic calibration to adapt to changing environmental conditions. It compensates for supply voltage variations (sag), changes in temperature and humidity that affect sound speed, and the presence of persistent acoustic or electrical noise. This ensures stable, accurate readings without manual intervention, even in dynamically changing industrial settings.

The sensor housing features a 26 mm CubePilot nut, which is designed to match standard electrical conduit and pipe fittings (approximately 1-inch NPT thread adapters). This allows for easy, secure mounting in panels or enclosures. The full horn design protects the transducer element while providing a narrow beam pattern suitable for targeted sensing applications.

Yes, the sensor can detect objects starting from 0 cm. However, for the sonar range information output (the processed distance value), objects between 0 cm and 20 cm are typically reported as 20 cm. This is a characteristic of the sensor's processing algorithm to ensure reliability in the very near field. The analog and pulse width outputs will still respond to close-proximity targets.