NDDS75 NB-IoT Distance Detection Sensor

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Based on the LSN50 Open Source platform, The waterproof (IP68) LNDS75 offers long range connectivity via NB-IoT networks. The LDDS75 uses ultrasonic sensing to measures distances between 280-7500mm (in typical conditions, around 25C, 65%). Temperature compensation is performed internally to improve the reliability of data. The LDDS75 can be applied to scenarios such as horizontal distance measurement, liquid level measurement, object proximity and presence detection, automatic control etc. Great for keeping an eye on your rain water tanks.
$135- +GST
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The NDDS75  is built for NB-IoT networks that offer incredible range with low data usage and minimal power consumption. Its IP68 waterproof design makes it suitable for outdoor use and it’s powered by a 8500mA Li/SOCl2 non-rechargeable battery. Due to its low power operation, users can expect years of operation with a moderate logging rate. 

The Ultrasonic distance sensor comes pre-fitted on the LDDS01 and by default, the data record containing the battery voltage and the object distance (in mm) is sent every 20 minutes.

The operating parameters and many other settings on the LSN50 can be modified via AT commands on the serial port interface, but an FT232RL USB-TTL converter is required for this task (not supplied).  The communications port can also be used to upload new firmware via the built-in bootloader.  Some settings can also be changed via the server, like the transmit interval, operating mode, confirmation mode and the reset command.

When used with Telemetry2U, the distance between the sensor and the top of the water or product is reported in millimetres, but you can calibrate or scale this to litres, percentage, or any other unit of your choosing on Telemetry2U’s IoT Platform. You can see you water level in real-time on your Smartphone or PC as well as set up alerts when the level drops to a point of concern.  You can read more on how the LDDS01 Ultrasonic distance meter can be used to detect the water level of your tank, pond, or dam here.

If you have any questions about how Telemetry2U can help you get your world on the IoT cloud, please get in touch with us today, we're here to help.

Attribute nameAttribute value
  • NB-IoT Distance Sensor Node
  • Flat object range 280mm - 7500mm
  • Accuracy: ±(1cm+S*0.3%) (S: Distance)
  • Measure Angle: 40°
  • Distance Detection by Ultrasonic technology
  • Ultro low power consumption
  • NB Bands: B1/B3/B8/B5/B20/B28
    Uplink via MQTT,TCP,CoAP or UDP
  • AT Commands to change parameters
  • IP66 Waterproof Enclosure
  • Uplink on periodically
  • Temperature Compensation for measurements
  • Monitor rain water tank levels
  • Monitor an object
  • Security
  • Measure distances
  • Detection

Power Consumption:

  • STOP Mode: 2.7μA @ 3.3v
  • RX Mode: 7.2mA
  • TX Mode: 125mA@ 20dbm 



  • Li/SOCI2 unchargable battery
  • Capacity: 4000mAh
  • Self Discharge: <1% / Year @ 25°C
  • Max continuously current: 130mA
  • Max boost current: 2A, 1 second
Package contents
  • 1 x LDDS01 module
  • 1 x External RF antenna 
  • Untrasonic sensor (fitted)
Dimensions and weight
  • Device wize: 130 x 50 x 45,m
  • Device weight: 150g
  • Package size: 140 x 80 x 50mm
  • Package weight: 180g

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