LoRaWAN Capacitive Soil Moisture, Temperature

The PM-WCS-3 family sensors is low-cost, accurate soil moisture sensor for monitoring water content, electrical conductivity and temperature of soil.

$69.03
(VAT excluded)
In stock
Commercially available
This product is already in mass production. Production batches are in route or stock is available. All certifications for the regional areas where the products are sold are obtained from competent institutions.
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  • device

Key features highlights :

  • Calibration functions for EC and Dielectric permittivity

  • Low cost and easy to use.

  • Dust and water proof, every sensor is tested by submerging it in to the water, battery box grade: IP65.

  • LoRaWAN class A device, may be activated with OTAA or ABP.

  • Setup via USB CDC-ACM virtual COM port.

  • Android application for USB setup. Get it on Google Play

Description :

LoRaWAN Capacitive Soil Moisture/Water content, Temperature and EC sensor

The PM-WCS-3 family sensors is low-cost, accurate soil moisture sensor for monitoring water content, electrical conductivity and temperature of soil.

Features:

  • Dust and water proof, every sensor is tested by submerging it in to the water, battery box grade: IP65.

  • LoRaWAN class A device, may be activated with OTAA or ABP for any LoRaWAN network supporting EU868.

  • Setup via USB CDC-ACM virtual COM port.

  • Android application for USB setup and free online monitoring via The Things Network gateways.

  • Demo Tinovi zerver.io cloud console for graphs and configurable event triggers

Data output

Format what you are usually getting from LoRaWAN is hex string, which you have to convert to bytes. Then data output is in binary format is total 9-byte long:

  1. 2-byte 16-bit signed integer (divide by 100) Dielectric permittivity (ε) (Temperature corrected) resolution: 0.1ε (avg.Tolerance 5%) and range 1 (air) to 80 (water)

  2. 2-byte 16-bit signed integer (divide by 100) Electrical Conductivity (dS/m) resolution: 0.01 mS/m (avg.Tolerance 20%)

  3. 2-byte 16-bit signed integer (divide by 100) Temperature (°C) resolution: 0.1°C and range: -20 to 60°C (avg.Tolerance 3%)

  4. 2-byte 16-bit signed integerVolumetric Water Content (%) resolution:0.1% and range: 0 – 100% VWC Note: VWC is calculated from dielectric permittivity by Topp equation (Topp et al, 1980): θ = 4.3 ⋅ 10−6ε3 − 0.00055ε2 + 0.0292ε − 0.053)

  5. 1-byte Battery voltage percent: measures battery voltage and calculates percentage from 2v to 5v; To calculate actual battery voltage use equition: 2+0.03(battery reading). for example if battery measurement shows 50% ,then actual voltage is 2+0.0350=3.5v resolution: 1% and range: 2v – 0% to 5v – 100%

LoRaWAN Downlink message to update data sending interval

Device supports LoRaWAN downlink message for device sleep time (data sending interval) adjustment. Message should contain 5 bytes, 1st byte is Ox01 and following 4 bytes is unsigned 32-bit integer time in seconds to sleep. For example sending HEX 010000000A will set interval to 10 seconds, but 0100000E10 will set interval to 3600 secs = 1 hour.

Power supply

Sensor consumes max 0.3 mA in sleep mode, 12 mA in active mode and 150 mA in transmitting mode. Recommended battery is 3.6v ER14505. Sensor also may be powered from any 5v Micro-USB power source. After power up sensors wait 10 seconds for USB configuration session connection from android application or USB CDC terminal, if none is connected sensors turns off USB hardware and starts normal operation.

Sensor calibration via Android application

Get it on Google Play

  1. remove battery, attach to phone
  2. open application & wait for  USB connected status or connect
  3. go to SETTINGS tab, 
  4. hold sensor in the air - click button AIR
  5. submerge sensor in the water or soil with water, click button WATER
  6. go to MAIN tab, click "read" button to check calibrated values
  7. To connect to LoRaWAN, disconnect from phone and connect to battery or any (other then android phone) Micro-USB power source.

Demo Online Monitoring via Android application

Get it on Google Play

For LoRaWAN sensors data is streamed online via LoRaWAN gateways connected to TTN.

Payload decoder sample

```

var bytesToInt = function(bytes, dev) { var sign = bytes[0] & (1 << 7); var x = ((bytes[0] & 0xFF) << 8) | (bytes[1] & 0xFF); if (sign) { x = 0xFFFF0000 | x; } return x/dev; };

function Decoder(bytes, port) { var decoded = {}; decoded.e25=bytesToInt(bytes.slice(0,2),100); decoded.ec=bytesToInt(bytes.slice(2,4),100); decoded.temp=bytesToInt(bytes.slice(4,6),100); decoded.vwc=bytesToInt(bytes.slice(6,8),1); decoded.bat = bytes[8]; return decoded; }

```

Android application Features

  • Demo Online LoRaWAN sensor monitoring via TTN connected gateways.

  • Setup USB and LoRaWAN soil sensors

  • Write USB and LoRaWAN sensor data to phone memory

  • View data on charts and export to CSV

  • Open Source Android application located there

!WARNING please remove device battery before attaching device to USB port for configuration. Leaving battery with attached USB power supply may damage battery or your device’s USB port.

!WARNING LoRaWAN device waits for 10 seconds after power up for configuration terminal software connection. After terminal connection it remains in configuration mode until terminal software is disconnected.

!WARNING device joining mode OTAA or ABP is switched automatically on configuration when you setup OTAA or ABP parameter.

Get it on Google Play

Specifications :
Seller Tinovi
Manufacturer name LoRaWAN Capacitive Soil Moisture, Temperature
Manufacturer Part number PM-WCS-3-LW
Product Attributes Metering, Temperature
Radio Frequency Band EU868 - Europe 863-870MHz
Solution Represented Smart Agriculture
Power supply Non rechargeable battery
Battery specification (Wh) 2.7
Battery type Lithium ion
Antenna Integrated
RF transceiver SX1276
Operating Temperature (min to max) -20C .. +60C
Depth (cm) 15
Width (cm) 15
Height (cm) 6
Technical docs

Datasheet:

Lead-time if backordered (in working days) 5
Is available for sale Yes
Lead-time if in Stock (in working days) 2
Technical documents PM-WCS-3-LW.pdf
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