🌱 Soil Tester with ESP32

NPK Sensor + 20x4 I2C LCD + Firebase + Android App

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📦 Project Description

This IoT-powered Soil Tester utilizes an ESP32 microcontroller to measure soil Nitrogen (N), Phosphorus (P), and Potassium (K) levels using an NPK sensor. It displays real-time values on a 20x4 I2C LCD and synchronizes data to Firebase Realtime Database, which is consumed by a custom-built Android app developed in Java using Android Studio.

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⚙️ Components Used

Component	Description
ESP32 Board	Main microcontroller with Wi-Fi + UART
NPK Sensor	Measures Nitrogen, Phosphorus, and Potassium
20x4 I2C LCD	Displays live NPK readings

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🔗 System Overview

1. ESP32 reads data from the NPK sensor via UART.
2. Data is displayed on a 20x4 LCD using the I2C interface.
3. Sensor values are uploaded to Firebase Realtime Database using Firebase_ESP_Client.
4. Android app fetches and displays the data in a mobile-friendly UI and suggests a plant perfect for the soil.

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💻 Arduino IDE Setup

1. Install these libraries:
   • LiquidCrystal_I2C
   • Firebase_ESP_Client
2. Configure Firebase in code:
   • Firebase Host (e.g., your-project.firebaseio.com)
   • Firebase Auth / Secret Key
3. Clone the repo:

   git clone https://github.com/qppd/Soil-Tester.git

4. Open SoilTester_ESP32.ino in Arduino IDE
5. Select board: ESP32 Dev Module
6. Upload to your ESP32 board

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📁 Project Structure

Soil-Tester/
├── SoilTester.ino
├── README.md
└── .gitignore

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📝 License

This project is licensed under the MIT License. You may use, modify, and share it freely with credit to the author.

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🙌 Acknowledgements

• ESP32 Arduino Community
• Firebase Realtime Database
• Arduino & open-source contributors

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🔗 Connect With Me

📘 Facebook	facebook.com/qppd.dev
📦 GitHub	github.com/qppd
🎥 TikTok	@jed.lopez.mendoza.dev
✉️ Email	quezon.province.pd@gmail.com

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