SoilMetrics

A Portable AI & IoT-Based Soil Health Monitoring Device

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Overview:

SoilMetrics is an affordable soil health monitoring system to measure key soil parameters in real time including NPK, EC, pH, Moisture, and Temperature. Which can empower small and marginal farmers to make informed decisions for improved crop management and sustainable agriculture.

Features:

• Measure soil moisture, temperature, pH, electrical conductivity, and NPK.
• Remote connectivity via LTE using SIM7080G module.
• Touch Based Interface to view sensor readings, AI recommendations, weather reports.
• Offline Data Logging in a onboard SD card.
• GPS connectivity for accurate weather reports via openweather API.
• on device rechargeable batteries (2S 18650) for portability.

Hardware Specifications:

• MCU - ESP32-S3-WROOM1U-N16R8
• Cellular & GPS - SIM7080G
• Soil Sensor - ZTS-3002-TR-*-N01
• Display - SmartElex 3.5" TFT Resistive Touch Display 320x480

Repo Structure:

SoilMetrics/
│
├── assets/   images
├── cad/       CAD source files & exports
├── firmware/       ESP-IDF firmware
├── kicad/          kicad source file
├── production/     BOM & gerber
│
├── README.md
├── LICENSE
└── JOURNAL.md

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Hardware:

Schematic:

Contains all the power realted things of the device including Type-c for programming, barrel jack for charging, BMS circuitory, Buck Converter and LDOs

Contains the MCU, Buttons, LTE module, Receiver, SD card, sim slot etc

PCB:

The hardware is designed on a 4 layer PCB, The complete design files are available here

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Enclosure

File	Download Link	Description
Top Body Enclosure	here	This is the source file of the top body
Bottom plate	here	This is the source file of the Bottom plate
Top Body Enclosure	here	This is the printable file of the top body
Top Body Enclosure	here	This is the printable file of the top body

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Firmware

Note: The complete firmware is not available as of now, there are lot of things that can only be written after making actual hardware, so i will update the repo with complete firmware after build. For now its just a test code.

Configure ESP-IDF

idf.py set-target esp32s3

Build

idf.py build

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Flashing Firmware

Connect the board using USB.

Flash

idf.py flash

Open Serial Monitor

idf.py monitor

If flashing fails, place the board into download mode according to your ESP32-S3 hardware design and retry the command.

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How to Assemble

1. Get the PCB manufactured using this file.
2. Order components listed in the BOM.csv
3. Assemble the board using KiCad source file as reference.
4. Inspect the PCB before powering it.
5. Connect teh TFT display, antennas, and soil sensor.

Enclosure:

Enclosure is not complete yet due to the online unavailability of 3d model of the Display. After getting the display i'll update the repo with correct files

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Bill of Materials

The completed BOM of the components used on PCB is in production/bom.csv.

And expect those you need to order these:

Component	Link	Price
SmartElex 3.5" TFT Resistive Touch Display 320x480	here	917 rs
ZTS-3002-TR-*-N01	here	4396 rs
2 x 18650 batteries	here	699 rs each
PCB + Stencil		Sub-8K rs

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Made with 🔬🧪 (science) by aryan-git-byte

# AI USE: AI has assisted me in firmware/