In the present day Scenario farmers are manually irrigating their lands. They feel it difficult to irrigate their lands at their convenience.It will be good, if there is a system by which one can automatically irrigate their lands. In this work, an Arduino based smart irrigation system has been proposed.A soil moisture sensor senses the moisture content of the soil .Based on the moisture content in the soil sensed by it,the Arduino system will tur on and Off the motor for irrigating their land. As the system is more automatic in nature, the farmers can do remaining agricultural work at their convenience.The prosed system has been developed as a prototype and tested for irrigation.The results were found to be satisfactory.