The proposed IoT-based Smart Irrigation System is designed to automate and efficiently manage agricultural irrigation while reducing water wastage and manual effort. The system uses a NodeMCU microcontroller as the main control unit, interfaced with soil moisture sensors and a DHT11 temperature and humidity sensor to continuously monitor soil and environmental conditions. Based on the sensor readings, the NodeMCU automatically controls the water motor through a relay, supplying water only when the soil moisture level is below the required limit. The collected sensor data is transmitted through Wi-Fi to a cloud platform and can be accessed by the farmer using an Android mobile application with a secure login ID. This enables real-time monitoring and remote control of the irrigation system from any location. Since the system consumes very low power, it can also be connected to a mini-UPS to ensure continuous operation during power failures. After the power supply is restored, the system automatically reconnects to the Wi-Fi network and resumes its normal operation without manual intervention. The NodeMCU is programmed using Embedded C through the Arduino IDE, making the system simple, low-cost, reliable, and suitable for agricultural fields of different sizes.          

Features:

 Automatic irrigation based on soil moisture level

 Real-time monitoring of temperature and humidity using DHT11

 IoT-based remote monitoring and control

 Android mobile application interface

 Wi-Fi connectivity using NodeMCU

 Automatic water motor ON/OFF control

 Cloud-based sensor data monitoring

 Remote access from any location

 Low power consumption

 Mini UPS backup for operation during power cuts

 Automatic Wi-Fi reconnection after power restoration

 Reduces water wastage and manual effort

 Low-cost and easy-to-implement system

 Suitable for agricultural fields of different sizes.            

The main blocks of this project are:

1. Regulated power supply.
2. Microcontroller (NodeMCU).
3. AC Water Motor with Relay driver.
4. Soil moisture sensor.
5. DHT11
6. LED.

       

Software used:

• ARDUINO IDE STUDIO Compiler.
• Express SCH for Circuit design.

       

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