The main aim of this paper is to develop an automated irrigation system based on sensors which are interfaced to the microcontroller unit. The sensors used in this paper are temperature and humidity sensor DHT11 sensor and soil moisture VH400. These sensors are interfaced to the microcontroller unit and the whole unit was placed under the root zone of the plant. The main motive of using microcontroller is to send an SMS to the mobile phone of an owner who is in the remote location. The sending of SMS is done by using SIM900A module which is also interfaced to the microcontroller unit. This irrigation system is tested under different temperatures and humidity levels of different plants. The use of soil moisture sensor is to limit the water content to the particular areas. © Research india publications.