Development of Two-In-One Type Drying Machine and Grinder Control System Based On Wireless Sensors Network

摘要

One potential application of Wireless Sensor Network (WSN) technology is the implementation of the temperature and humidity monitoring system on paddy drying machine. The advantage of the WSN in a dryer is the number of sensors can be increased without increasing the number of cable installation on the machine. This paper presents the design and analysis of the WSN performances for real-time temperature and humidity monitoring system on grain dryer machine. There are two evaluations that be conducted, i.e. the analysis of Received Signal Strength Indicator (RSSI) and evaluation of the power consumption of the WSN nodes. All the evaluations were conducted using the 2 mW XBee modules as WSN nodes in a star topology configuration. The evaluation results indicate that the signal range of the WSN will decline against the distance with or without metal obstacle. At the same RSSI value, the presence of the metal obstacle will significantly reduce the signal range (about 40 meters). For testing battery lifetime, increasing the value of the transmission interval linearly will raise the lifetime of the battery. But, increasing the interval transmission will decrease the quality of monitoring process. Our future work is evaluating the overall performances of the monitoring system.