Getting Started - SensorNode Bluetooth®

This guide covers set up the SensorNode Bluetooth® and pairing with a DM device.

In the Box

In the SensorNode box you'll receive a DM SensorNode, with 6 two glands (in place). The PCB is screwed into the housing with four screws, with six screws for securing the housing lid and an pre-installed seal for ensuring an IP67 seal.

One gland will be fitted with a stopper to prevent water ingress when no cable is fitted. DM can supply extra stoppers if both are going to be unused, or as replacements.

Setting it Up


The SensorNode uses three off the shelf AA Lithium Batteries and does not have reverse voltage protection so take care to insert the batteries with the correct polarity, the tabs being the negative terminals.


It is very important to use 1.5V Lithium batteries. If you use normal Alkaline AA batteries then they will only operate for about 40% of their useful life.


Once any wiring is done (see below) and batteries are installed, all that remains is to seal the housing. Seal the device carefully to achieve the IP-67 rating. Ensure that the clear silicon seal is in good condition, is lying flat, and is not fouled by any plastic debris or other material.

  • Close the housing, and gently squeeze it shut. Foam on the lid will compress against the batteries, holding them firmly in place.
  • Tighten the 6 screws to a uniform tightness. On the first assembly, the screws may be quite stiff.
  • If you wish to replace the batteries and open the housing, be sure to check that the silicon seal is in good condition before closing the housing again.

Wiring in Sensors

Please note, Wires will need to be inserted through the gland in the housing first, then wired into the PCB.

On the board, you will see a strip of screw terminals, 4 of them are used for the I2C Bus.

  1. GND 
  2. SDA
  3. SCL
  4. 3.3V

The connections for each sensor are as follows:

DM Ambient Sensor

Currently not supported for Telematics Guru, the data is visible in Third party platforms if scanned as a tag.

DM Temperature Probe 1 or 2

Each I2C sensor has an address. For the Ambient sensor this is set at the factory and fixed to one address.
The Temperature sensor can be given 1 of 2 addresses, depending on how it is wired (green wire sets address).

Connections are as follows:

Wire ColourFunctionInserts into
RedPositive wire3.3V
GreenAddress SelectionGround for Temp Sensor 1
3.3V for Temp Sensor 2


Where the green wire is connected dictates which sensor you should select when setting up your system parameters. E.g it is connected to GND, set the Falcon up to measure "DM Temp Probe 1"

The wiring for the connection of a Digital Matter Temperature Probe 1 is shown below

 Viewing Sensor data in Telematics Guru

please view the article on configuring and viewing the sensor's data in Telematics guru platform

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