💧 ESP-NOW Water Level Monitoring System

Wireless Tank Level Indicator using ESP-12F (Sender) and NodeMCU (Receiver)

---

📖 Overview

This project implements a wireless water-level monitoring system using two ESP8266 boards communicating via ESP-NOW protocol.
It measures and displays the water tank level, triggers alarms for high/low levels, and requires no Wi-Fi connection.

• ESP-12F (Sender) — Reads water level using AJ-SR04M waterproof ultrasonic sensor.
• NodeMCU (Receiver) — Displays level on LCD, activates LEDs & buzzer, and stores settings in EEPROM.

---

⚙️ Features

✅ ESP-NOW wireless communication (no router needed)
✅ Real-time LCD display
✅ High/Low water level alarms
✅ EEPROM memory for saved thresholds
✅ MAC address pairing for security
✅ Data averaging filter for smooth readings
✅ Optional relay for motor/pump control

---

📁 Folder Structure

Folder	Description
ESP-12F_SENDER/	Code for ESP-12F Sender Node
Nodemcu_Receiver/	Code for NodeMCU Receiver Node
README.md	Documentation (this file)

---

🔧 Hardware Required

Component	Description
ESP-12F	Sender board
NodeMCU ESP8266	Receiver board
AJ-SR04M Ultrasonic Sensor	Waterproof distance measurement
16x2 I²C LCD	Displays water level
Buzzer	Sound alert
LEDs	High/Low water indicators
EEPROM	Stores configuration

---

🪛 Pin Configuration

🔹 ESP-12F (Sender)

Function	Pin
Trigger (AJ-SR04M)	D1 (GPIO5)
Echo (AJ-SR04M)	D2 (GPIO4)
Status LED	D0 (GPIO16)

🔹 NodeMCU (Receiver)

Function	Pin
LCD SDA	D2 (GPIO4)
LCD SCL	D1 (GPIO5)
High Level LED	D6 (GPIO12)
Low Level LED	D7 (GPIO13)
Buzzer	D5 (GPIO14)

---

💧 Water Level Formula

Water Level (%) = ((Tank Height - Distance) / Tank Height) * 100

Example:
Tank Height = 127 cm
Measured Distance = 25 cm
→ Water Level = 80.3%

---

⚠️ Alarm Logic

Condition	Water Level	Action
Low Level	< 20%	Red LED + Buzzer ON
Normal	20–95%	Green LED ON
High Level	> 95%	Green LED Blink + Buzzer Beep

---

📡 ESP-NOW Communication

• Sender transmits readings periodically via ESP-NOW.
• Receiver accepts packets only from a paired MAC address.
• Works without Wi-Fi or internet.

---

🧰 Installation

🔧 Required Libraries

Install these in Arduino IDE:

• ESP8266WiFi.h
• espnow.h
• LiquidCrystal_I2C.h
• EEPROM.h

🖥️ Board Settings

Setting	Value
Board	NodeMCU 1.0 / Generic ESP8266
Flash Size	4MB
Upload Speed	115200
Flash Mode	DOUT or QIO

🚀 Upload

1. Open ESP-12F_SENDER/ESP-12F_SENDER.ino → Upload to ESP-12F
2. Open Nodemcu_Receiver/Nodemcu_Receiver.ino → Upload to NodeMCU
3. Power both boards and enjoy wireless water-level monitoring 🎉

---

🧠 Future Upgrades

• 🌤 Add DHT11 (temperature/humidity)
• ☁️ Integrate with Blynk or MQTT
• 🗣 Google Assistant voice control
• 🔋 Deep-sleep battery optimization
• 📲 Mobile app dashboard

---

👨‍💻 Developer

Madeshwaran M
💡 IoT Developer | Embedded Systems Enthusiast
📍 India

---

🪪 License

This project is released under the MIT License —
You can freely use, modify, and distribute with credit.

---

⭐ Support

If you like this project:

• Give it a ⭐ on GitHub
• Share it with your maker friends
• Suggest new features or improvements 🚀