This repository is developed in Kuituhamppu käyttöön -project

https://lapinamk.fi/hanke/kuituhamppu-kayttoon/

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tequ-iot-soil-moisture-esp32

Soil moisture measurement system. Collects data from Ruuvitag sensors and DFRobot soil moisture sensors. In this project system is used to measure biomass temperature and moisture from three different locations (bottom, middle and top). Biomass is located in compost unit. Ruuvitag sensors are used to measure outdoor and indoor temperature and relative humidity.

System can send data to cloud using wifi connection or LoRaWAN.

System is designed to work multiple years without need to change batteries.

Hardware

Hardware components are placed industrial IP68 rated enclosure.

Hardware	Model	Placement	Link
Main board	Seeed XIAO ESP32S3	Enclosure	Link
LoRaWAN module*	Grove Wio-E5		Link
RS485 Module	Grove - RS485		Link
DC/DC module	Adafruit		Link
Battery pack	3x1.5 AA		Link
Outdoor sensor			Link
Indoor sensor			Link
Soil moisture sensor			Link

• LoRAWAN module is optional.

Connections

Connections of the hardware used in prototype.

Device	PIN	Device	PIN
Main board	BAT+	Battery pack	Battery +
Main board	BAT-	Battery pack	Battery -
DC/DC module	VIN	Battery pack	Battery +
DC/DC module	GND	Battery pack	Battery - (GND)
DC/DC module	EN	Main board	GPIO9 (D10)
LoRaWAN module	GND	Battery pack	GND
LoRaWAN module	VCC	Main board	3V3
LoRaWAN module	UART TX	Main board	GPIO1 (D0)
LoRaWAN module	UART RX	Main board	GPIO2 (D1)
RS485 module	GND	Battery pack	GND
RS485 module	VCC	DC/DC module	5V
RS485 module	UART TX	Main board	GPIO3 (D2)
RS485 module	UART RX	Main board	GPIO4 (D3)
Soil sensor 1,2,3	GND	Battery pack	GND
Soil sensor 1,2,3	VIN	DC/DC module	5V
Soil sensor 1,2,3	GND	RS485 modul	RS485 TX
Soil sensor 1,2,3	GND	RS485 modul	RS485 RX

Connection diagram:

TBD

Development

1. Install Thonny (https://thonny.org/)

2. Connect and verify ESP32

3. Build connections between devices

4. Add LoRaWAN module to Digita LoRaWAN portal (or any other compatible platform you like to use)

5. Update ESP32 Micropython using Thonny

6. Clone this repository You can clone the repository with the command:

git clone https://github.com/Lapland-UAS-Tequ/tequ-iot-soil-moisture-esp32

or by downloading and unzipping the repository.

8. Create settings.json In the repository you'll find template files.

9. Open folder in Thonny and upload files into device

10. Run project and verify operation