Uploaded June 2025 | Updated September 2026, 1 week ago

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Automatic irrigation system for plants with temperature, humidity, soil moisture level display in LCD. This smart Irrigation system will automatically supply water to plants in garden by sensing the water moisture content in soil. For sensing water percentage, soil moisture sensor is used. For sensing temperature and humidity, DHT11 sensor is used. When soil moisture level drops below set value then the Arduino turns 'ON' the relay. When soil moisture level reaches the upper set limit then relay is turned 'OFF'. A DC water pump motor is connected to relay output which pumps water to the soil. When relay is ON them pump is ON and when relay is OFF then pump is OFF. The readings of sensors and pump ON / OFF status is displayed in a I2C LCD display.

Required components:
1) Arduino Uno R3 -1
2) Soil moisture sensor - 1
3) DHT11 sensor - 1
4) 1CH relay board -1
5) LM2596 Buck converter -1
6) Mini DC Water Pump -1
7) I2C LCD display -1
8) 12V 1A adaptor - 1
9) Buzzer -1