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Intermediate

ARDUINO

Project Specific

3 – 6 Hours

Partial Kit

Smart Water Quality Monitoring System Using IoT

An IoT-based water quality and aquaculture monitoring system that tracks pH, temperature, and soil moisture using Arduino and NodeMCU, displaying real-time data on a web server.

Originally published on CircuitDigest

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Arduino UNO R3 Board (Compatible) – ATmega328P Microcontroller with USB Cable Rs. 999.00
NodeMCU ESP8266 WIFI development board based on CP2102 Rs. 660.00
DS18B20 Water Proof Temperature Probe Out of stock
Soil Moisture Sensor Rs. 75.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Turbidity / pH / TDS Sensor

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How It Works

The Smart Water Quality Monitoring System operates by combining sensing hardware with microcontroller processing and wireless communication to track environmental conditions in real time. At the heart of the sensing array are the Gravity Analog pH sensor, the DS18B20 temperature sensor, and a soil moisture sensor, all temporarily interconnected via a breadboard and powered by a stable power supply. The Arduino Uno acts as the primary data acquisition hub, reading the analog voltage from the pH and moisture sensors while communicating digitally with the DS18B20 temperature sensor using the OneWire and DallasTemperature libraries. Once the environmental parameters are measured, the Arduino processes the raw inputs. To bridge this local data collection with the internet, the NodeMCU (ESP8266) is integrated into the architecture. Using its built-in Wi-Fi capabilities and the ArduinoJson library, the NodeMCU formats the sensor readings into structured data packets and transmits them over a local network. This allows users to access live updates through an embedded web server hosted directly on the ESP8266, providing continuous oversight of water and soil conditions for agricultural or environmental applications without requiring physical checks at the deployment site.

Why Build This

Gain practical experience deploying multi-sensor IoT architectures suitable for modern precision agriculture and aquaculture management.

Learn how to integrate distinct microcontroller platforms—combining the robust analog reading capabilities of an Arduino Uno with the Wi-Fi connectivity of an NodeMCU.

Develop functional web servers on microcontrollers to stream and visualize real-time environmental data streams for remote monitoring.

Real-World Application

Agriculture, aquaculture, wastewater treatment, and environmental monitoring for efficient crop and livestock management.

Skills You'll Learn

Analog sensor interfacing

OneWire digital communication

microcontroller-to-microcontroller serial communication

Wi-Fi network integration

JSON data serialization

web server hosting on microcontrollers

Safety Precautions

No specific precautions noted for this build — always follow general electronics safety practices.

Frequently Asked Questions

Why are both an Arduino Uno and a NodeMCU used in the same project?

The Arduino Uno provides reliable analog-to-digital conversion and digital pin support for the various sensors, while the NodeMCU handles the Wi-Fi connectivity needed to host the web server, as the Uno lacks built-in wireless capabilities.

How does the DS18B20 communicate with the microcontroller?

The DS18B20 uses a specialized digital protocol called OneWire, which allows it to transmit precise temperature data over a single data line using the corresponding Arduino libraries.

Can this system be powered via a standard USB port?

Yes, the components can generally be powered during development via USB connections, provided the power supply is stable enough to support both microcontrollers and the active sensors simultaneously.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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