In the field of agriculture, use of the proper method of irrigation is crucial. To have it done with reduced human intervention and still ensure proper irrigation is a challenge. We have developed an automatic irrigation system which switches the pump motor ON/OFF on sensing the moisture content of the soil. The soil Moisture Sensor module is used to detect the moisture of soil and infer to the volumetric presence of moisture present in the soil and if there is water on the sensor. We would use this module and insert it into the soil and then adjust the on-board potentiometer to modify the sensitivity. The sensor would give us the output logic HIGH when the moisture is higher and LOW when it is lower than the threshold value set by the potentiometer. The Soil Moisture sensor measure the volumetric water content in the soil, indirectly by using some other property of the soil, such as electrical resistance, dielectric constant or interaction with neutrons, as a substitute for the moisture content. We will preferably design soil moisture sensor using Arduino. An Arduino code will be used which will read the amount of moisture present in the soil and accordingly send information from the moisture sensor to the phone via the GSM module.