An Effective Method for Soil Moisture Sensing Using Arduino Uno and Interfacing with GSM Sim900

India being a land of agriculture, it is of prime importance to focus and improve the methods used for farming. This is called Precision farming wherein agricultural processes like irrigation or testing the nutrition content of the soil in terms of fertility is taken care of. Also, better yield requires advanced irrigation which can maintain adequate moisture in soil providing optimal water to the crops. Soil moisture sensors have been widely used to monitor the moisture. This paper proposes a novel method to improve the conductivity of a soil moisture sensor. A YL-69 soil moisture sensor is coated with Polyaniline nanofiber (PANI) to improve its conductivity. A GSM module is also used to send the sensor readings directly to an output device – in this case a computer. This low cost manufacturing process is a significant enhancement in the field of Precision Farming.