MaxBotix MB7138 XL-TrashSonar-WRM Outdoor Ultrasonic Sensor Module - IP67 Weather Resistant

The MB7138 provides three simultaneous output formats: an analog voltage that scales with distance, a pulse width directly proportional to range, and an RS232 serial data stream. You can use any single interface that matches your controller's inputs. For example, connect the analog output to an ADC pin on an Arduino, or the serial TX line to a UART for direct distance readings in centimeters.

The IP67 rating ensures the sensor is dust-tight and can withstand temporary immersion in water up to 1 meter deep, making it ideal for exposed outdoor environments. Its housing is threaded with a 44 mm outer diameter, allowing for direct mounting into standard electrical conduit fittings, which simplifies enclosure and protects the wiring connections.

This feature continuously adjusts the sensor's internal parameters to compensate for changing environmental conditions such as supply voltage fluctuations, variations in temperature or humidity, and ambient acoustic noise. This ensures stable, accurate distance readings without requiring manual recalibration, which is critical for reliable 24/7 operation in dynamic outdoor settings.

Yes, the sensor can detect objects from 0 cm. However, due to the physical characteristics of ultrasonic ranging, objects within the first 20 cm will typically be reported as 20 cm. For precise very-short-range measurements (under 20 cm), consider a sensor from MaxBotix's close-range HRLV or HRUSB series.