The smart irrigation system is an automatic irrigation system which is being widely used in the field of agriculture. Irrigation is practiced in farms where there is a scarcity of water. This smart irrigation system is a farmer-friendly irrigation system ,which is completely automated. This system runs without intervention of humans. This smart irrigation system, using Arduino-Uno, checks the moisture level in the soil. If the moisture level in the soil is low, it automatically sends an alert message and turns on the water motor to flow water to the soil. If the moisture level in the soil is sufficient, it switches off the motor. This system helps in agricultural crop growth and soil maintenance. The smart irrigation system reduces the effect caused by insufficient rainfall. This irrigation system prevents excess of water flowing into the soil which causes a wastage of water, electricity and damage to the soil, effectively.