Average rainfall 2001-2016, global tropics

Map: Average rainfall 2001-2016, global tropics

sensor: Internet of Things soil moisture probes

Thomas Gumbricht bio photo By Thomas Gumbricht

Introduction

Soil moisture devices that can act as stationary Internet of Things (IoT) devices.

Article: How IoT Soil Condition Monitoring Is Empowering Farmers

Many companies offer Soil monitoring with IoT, among them mtg.

To look for devices I used the sigfox partner network with a search set to soil.

Simpler devices for Arduino include probes that are based on resistivity or capacitans. The former eventually erode, regardless of the metal used, the latter are more durable. The youtube presentation by Andreas Spiess: Why most Arduino Soil Moisture Sensors suck (incl. solution), summarizes the alternatives.

Youtube

Youtube overview of Arduino soil moisture sensors.

Youtube LoRa

LoRa

LoRa (Long Range) is a low-power wide-area network (LPWAN) technology. It is based on spread spectrum modulation techniques. LoRa enables long-range transmissions (more than 10 km in rural areas) with low power consumption. LoRa devices have geolocation capabilities used for triangulating positions of devices via timestamps from gateways. LoRa and LoRaWAN permit long-range connectivity for Internet of Things (IoT) devices in different types of industries.

Arduino Pro Gateway for LoRa.

This LHT65 LoRaWAN SHT20 Temperature and Humidity Sensor is available at elfa.se.

LoRa + Arduino project for soil moisture

HD Denmark

https://www.digital.hededanmark.com/portfolio/soil-moisture-sensors/?xdomain_data=D84RScBZBtAO2xDX4HmTI9y5b4ZQl9CIWjRpHFFxwnbXctq3j4Nd5oyTPok%3D.

EVVOS

Irrigation solution UC1

Wired article

A Solar-Powered Soil Sensor for Serious Gardeners

Enviro Pro

Enviro Pro is an Australian company.

Arduino based stand alone thing

LHT65 LoRaWAN Temperature & Humidity Sensor Built-in SHT20 - 868MHz

Same device from UK

Arduino capacitive moisture sensor

You get a capacitive moisture sensor from Banggod for around 3 USD. In Sweden you can get it for 6 USD through fyndiq.se.

Under 1 USD at Ali Express