In the present scenario of agriculture, production of crop has become a great challenge in places with scared resources. Hence a data driven approach using Internet of Things to determine the volume of water required for irrigation has been taken into consideration. Sensors are implemented all over the crop field to collect the parameters of crop field in real time that are processed remotely to determine the volume of water. Therefore, accurate readings from the sensors in a crop field play an important role to determine the amount of water to irrigate in the field. In this paper the authors have created a testbed to show about the effect of improper placement of sensors in soil can spoil the readings obtained from testbed. In this testbed model a client server model has been prepared using ESP32 that collects soil moisture, temperature and relative humidity over the area and sends it to the central node (server) using ESP-NOW protocol. The field parameters collected from this model have been plotted to show the variation among the field parameters.