The Population grows every year. Based on a survey in 2015-2045 shows that the population will increase from 255.6 million to 319.0 million. The effect of population growth will increase the need for food too. In supporting of food needs, therefore we need technology to be used in conducting real-time monitoring. Wireless Sensor Network (WSN) is a well-implemented technology in monitoring systems. Implementing WSN for monitoring systems purposes to put a sensor node in an area that aims to monitor the environment condition, such as temperature, CO2, O2, and soil moisture. The use of WSN on a monitoring system can be more efficient in the use of human energy, reducing costs, and producing accurate monitoring data. This research proposes hardware that is used to monitor the greenhouse condition in real-time, such as temperature, humidity, and soil moisture. Furthermore, the result from the temperature inside the greenhouse has an error of 2.9%. The percentage of error from the humidity measurement is 1.7% meanwhile, the percentage of error from the soil moisture measurement is 1.9%.