SMART AUTOMATIC PLANT IRRIGATION
This is not a simple plant irrigation. This will never start watering until the soil is dried uniformly. Generally  the circuits have only one sensor nut here the sensors are in parallel this causes the watering only when over all land is dried.
The Project presented here waters your plants regularly when you are out for vocation. The circuit comprises sensor parts built using op-amp IC LM324. Op-amp’s are configured here as a comparator. Two stiff copper wires are inserted in the soil to sense the whether the Soil is wet or dry.
The Microcontroller was used to control the whole system it monitors the sensors and when more than two sensors sense the dry condition then the microcontroller will switch on the motor and it will switch off the motor when all the sensors are in wet. The microcontroller does the above job it receives the signals from the sensors, and this signals operated under the control of software which is stored in ROM.