Implementation Of Distributed Cabinet Temperature Monitoring System Based On WSN

The physical world and the public or private networks can be connected using Wireless Sensor Networks (WSNs) with corresponding network interfaces, which is widely used in various realms. We implemented a distributed cabinet temperature monitoring system based on WSN, which has the feature of easier operation, high stability as well as long standby time.Firstly, we describe the main architecture of this system. It is composed by central controllers and the temperature detectors. In the work site, users can view the historical temperature data as well as configure the state of temperature detectors easily with central controllers. At the same time, users can transmit the data to local/remote servers through the Ethernet/Wi-Fi or GPRS module in central controllers, while receiving the instructions from local/remote servers.Secondly, we describe the hardware design and the driver design of central controllers. The central controllers are based on the mini2440of FriendlyARM, which has expansion of power module. GPRS module, DM9000NIC module, LCD module, USB module, RS232/RS485/SPI module, etc. We also describe the driver design of central controllers based on Linux.Thirdly, we introduce the user space program based on Qt on central controllers, mainly focus on the data flow, pseudo-time synchronization algorithm, networking interface of the control systems, GPRS/Ethernet data transmission, alarm message sending as well as the UI design.Finally, we describe the hardware and the software of the temperature detectors. As to the hardware design, we focus on the RF module,microcontroller module, temperature detection and the low-voltage detection. For the software design, we focus on data collection module, the data format, the data buffer mechanism and the use of inner Flash. Most importantly, the temperature detector should have lower power consumption, so we also discuss the low power consumption design from both hardware and software separately. In this design, we take the versatility of system into consideration, so we can apply this monitoring system to other field, thus having a relatively high application value.