ClimateMinder™ Wireless Network

Wireless Nodes and Sensors


ClimateMinder Wireless Network

The ClimateMinder Wireless Network is a patent-pending technology system enabling field sensors and controls to work together seamlessly. It includes a self-adjusting wireless network of nodes (with sensors or controls that can be attached to each node) and a gateway that communicates with the ClimateMinder Web Server. ClimateMinder Wireless Network provides the flexibility growers need.

  • Wireless, so you don’t need to maintain a PC in field facilities or run wires between sensor or controller nodes.
  • Self-organizing wireless network that provides maximum versatility, reliability and cost effectiveness, so you don’t need to manage the network or spend a fortune on expensive weather stations.
  • Battery and solar-powered, and optimized for low-power operation.
  • Connected to the Internet via a wireless data connection, just like your mobile phone.

Each network node is able to communicate wirelessly with other nodes. There are sensor nodes for monitoring important conditions like temperature, humidity, soil moisture, solar radiation and leaf wetness, and relay controls for activating devices like irrigation, heating, vents, lighting, misting and fans. Each node is capable of operating up to four sensor probes or up to eight relays. Click below for more information.

Wireless Nodes

WirelessSensor mdThe ClimateMinder wireless  network is a collection of nodes, each of which is able to communicate with the other nodes using a radio module. One or more sensors or control relays are connected to each node. Each node controls whatever sensors or relays are attached to it, communicating sensor or control data to and from the Gateway mode. The Gateway node is the node that communicates with the ClimateMinder Server using a GSM modem.

Each node is a weather-proofed enclosure containing the hardware components required for its task, possibly including: wireless radio, external antenna, battery, interface module, power module, GSM radio, and node controller.

Nodes form a self-configuring network (when the device is switched on, it introduces itself to the network and finds its neighboors to send data), that is also self-healing (if a node is broken along the route, other nodes route information through another path), and is optimized for low power operation.

There are 3 kinds of nodes:

Sensor or control node         

This device controls up to four attached sensors or one relay.

8-way controller          

This device has eight relay outputs.

Gateway node          

This device communicates with the ClimateMinder Server and includes one temperature/humidity sensor.

Technical Specifications for each node:

  • RF Frequency: 2.4 GHz (IEEE 802.15.4)
  • Communication Protocol: GrowFlex™
  • Outdoor Range Per Single Hop: typically 2000 ft, with line of sight
  • Batteries:                   
    • 12V Sealed Lead Acid Battery
  • Solar Panel:                   
    • Gateway: 20W
    • Wireless Station: 5W


Sensors are measurement devices that are connected to wireless nodes. The environmental values that can be measured by the ClimateMinder sensor nodes are: Ambient temperature and humidity, Soil Moisture, Soil Moisture/Temperature/Electrical Conductivity (EC), Solar Radiation and Leaf wetness.

Ambient Temperature and Humidity Sensor

m4The CM-SP-TH digital humidity and temperature sensor is a high-quality  humidity sensor series with cutting edge accuracy. A unique capacitive sensor element is used for measuring relative humidity while temperature is measured by a band-gap sensor. The capacitive humidity sensor  is fully calibrated and provides a digital output. Every humidity sensor is tested upon quality and accuracy compliance. Certficate of conformance on batch level is available on request.


Sensor technical specifications:

  • Relative humidity operating range: 0 – 100% RH
  • Accuracy (humidity): +/- 1.8% RH
  • Typical resolution (humidity): 0.05 % RH
  • Temperature operating range: -40 – +125°C (-40 – +257°F)
  • Accuracy (temperature): +/- 0.3 °C
  • Typical resolution (temperature): 0.01 °C

Soil Moisture Sensor

m5The CM-SP-SMS  sensor for measuring soil water content will enable you to monitor soil moisture accurately and affordably

This probe measures the dielectric constant of the soil in order to find its volumetric water content. Since the dielectric constant of water is much higher than that of air or soil minerals, the dielectric constant of the soil is a sensitive measure of water content.

The two-prong design and higher measurement frequency allows the sensor to measure VWC from 0 to 100%, and allows accurate measurement of all soil types and a much wider range of salinities.

Sensor technical specifications:

  • Accuracy: at least 0.003 m3/m3 all soils, up to 8 dS/m with soil-specific calibration: ±.02 m3/m3 (±2%)
  • Resolution: 0.001 m3/m3 VWC in mineral soils, 0.25% in growing media
  • Operating Environment: -40 to +60 °C
  • Range of Measurement: 0 to 100% VWC (variable water content)
  • Probe dimensions: 8.9cm x 1.8cm x 0.7cm

Soil moisture, temperature and electrical conductivity (EC)

m6The CM-SP-SMEC is designed to measure the water content, electrical conductivity, and temperature of soil and growing media. Using an oscillator running at 70 MHz, it measures the dielectric permittivity of soil to determine the water content. A thermistor in thermal contact with the probe prongs provides the soil temperature, while the screws on the surface of the sensor form a two-probe electrical array to measure electrical conductivity.


Sensor technical specifications:

    • Dimensions: 10 cm (1) x 3.2 cm (w) x 0.7 cm (d)
    • Prong Length: 5.2 cm
    • Operating Temperature: -40-50 °C

Volumetric water content:

    • Range: Apparent dielectric permittivity (εa): 1 (air) to 80 (water)
    • Resolution: εa: 0.1 εa (unitless) from 1-20, ‹0.75 εa (unitless) from 20-80
    • VWC: 0.0008 m3/m3 (0.08% VWC) from 0 to 50% VWC
    • Accuracy: (εa): ±1 εa (unitless) from 1-40 (soil range), ±15% from 40-80
    • (VWC):   
      • Using Topp equation: ±0.03 m3/m3 (±3% VWC) typical in mineral soils that have solution electrical conductivity ‹10 dS/m
      • Using medium specific calibration, ±0.01 - 0.02 m3/m3 (± 1-2% VWC) in any porous medium

Electrical Conductivity (bulk)

    • Range: 0-23 dS/m (bulk)
    • Resolution: 0.01 dS/m from 0 to 7 dS/m, 0.05 dS/m from 7 to 23 dS/m
    • Accuracy: ±10% from 0 to 7 dS/m, user calibration required above 7 dS/m


  • Range: -40-50 °C
  • Resolution: 0.1 °C
  • Accuracy: ±1 °C

Solar Radiation Sensor

m7The CM-SP-SR Pyranometer Sensor, or solar radiation sensor, is calibrated to measure the shortwave radiation reaching the Earth's surface, measured in Joules m-2 s-1 or Watts m-2. The evaporation of water from soil and the transpiration of water from plant leaves are partly determined by the intensity of shortwave radiation

Sensor technical specifications:

  • Designed for continuous outdoor use (-40 to 55º C)/li>
  • Responsivity: 0.20 mV per W m-2
  • In Full Sunlight: 1100 W m-2
  • Linear Range: 0 - 1750 W m-2
  • Accuracy: ± 5%

Leaf Wetness Sensor

m8The CM-SP-LWS Leaf Wetness Sensor (LWS) determines the presence and duration of canopy wetness, allowing you to forecast disease and protect the plant canopy. Because the Leaf Wetness Sensor measures the dielectric constant, droplets do not need to bridge electrical traces for the sensor to detect moisture. The presence of water or ice anywhere on the surface of the sensor will be detected. The sensor measures leaf surface wetness by measuring the dielectric constant of the sensor’s upper surface.

Sensor technical specifications:

  • Output: 320-1000 mV @ 3V excitation
  • Operating Environment: -20 to 60°C
  • Probe Dimensions: 11.2cm x 5.8cm x .075 cm

Read 2204 times Last modified on Saturday, 23 March 2013 12:28

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