This research has created a monitoring system by employing wireless sensor networks technology to monitor environmental conditions of greenhouses using the NRF24L01+ module with an Arduino board. In this system, the connection between the sensor node and base station is established by the NRF24L01+ module, and the data gathered is transferred by the sensor node to a base station. Gathered data, having been transferred to the base station, will be transferred to an Internet database to be stored so that the user can utilize the data through his/her mobile phone or by visiting web pages. This research examines the sensors used in a greenhouse environment and calculates some evaluating parameters, such as reliability, average packet transfer delay, power consumed and data transfer rate. Consistent with these evaluations, the proposed system’s reliability at the 10-meter distance from the base station was 92.25%, being acceptable for this application. The average delay of the packet transfer was 206 milliseconds in one hour, being insignificant. This indicates that the sent packets were transferred to the base station in a very short time. The total energy consumption of 36 Watts per day suggests that the module had a low energy consumption. The wireless transfer module used in this project was also compared to other wireless transfer modules. It was determined that this module was more effective than other modules regarding the coverage rate and data transfer.
