The diagram below shows the specific parts of the sensor. 

Read further to explore the functionality of each part of the sensor.

1. Sensor Connecting Lead

2. Sensor On/Off Switch

3. USB Port

4. Status Indicator

5. Unique ID Number

6. Soil Moisture Probe ID Number

7. Soil Moisture Probe 

Sensor Connecting Lead (1)

The Sensor Connecting Lead plugs into the end cap of the wireless sensor. 

Sensor On/Off Switch (2)

The sensor's on/off switch allows you to turn the sensor on, off or perform a "hard reset".

To switch the sensor off

  • Press and hold down the On/Off switch until the white light shows, then release.
  • If not communicating with the EasySense app, the sensor will turn off after a period of one hour of inactivity. 

Hard resetting the sensor

  • If necessary, attach the sensor to power.
  • Press and hold down the On/Off button for at least 8 seconds until the status LED gives a flash of blue light, then release.
  • If the sensor fails to respond, contact Product Support at Data Harvest. Please provide details of:  
    • The computer platform it is being used with and the EasySense app’s version number.
    • A description of the problem being encountered. 

USB Port (3)

Use to connect to a computer or a charging unit.

For specific USB or Bluetooth connectivity instructions, please see the 'Connectivity' section of this documentation. 

For instructions on charging your device, see the section on 'Charging the Sensor'. 

Status Indicator (4)

The sensor features a single status indicator that changes colour and flashes. See the table below for further information.

Status Light


No light

Sensor is Off. Short press the On/Off switch

Blue flashing

Sensor is On and Bluetooth advertising

White flashing

Charging via USB mains charger or USB port,

Sensor is On and Bluetooth advertising

Red, Green, Blue Flashing

Charging via USB mains charger or USB port,

Sensor is Off

Green flashing

Communication with the EasySense2 app (via USB or Bluetooth) has been established

Solid Green

Fully charged

Orange flashing

Recording Data

Red flashing

Battery is low

Unique ID Number (5)

All Smart Wireless Sensors are labelled with a unique ID number. This number is used in the EasySense app, so that you can identify each sensor when making a connection wirelessly.

Soil Moisture Probe ID Number (6)

The part number for the probe is presented, at the point shown, for easy reference. The above depicts the SM120, with a maximum vertical penetration depth of 12 cm. 

Soil Moisture Probe (7)

This is a dedicated probe for soil moisture that will allow easy measurement. This has a calibrated ruler with 10 cm and 12 cm (vertical depth) marks for measurement reproducibility. The probe has a tapered end to allow easier insertion to pre-loosened ground.