Abstract
As the rapid development of technology modernization, remote monitoring system has been widely used in industry, security and healthcare. It is an automation system based on communication technology and server technology, and its main functions include data acquisition, wireless transmission, and remote control. This thesis presents a design and implementation of remote monitoring system by means of 3G mobile technology, and it is composed of wireless sensor networks (WSNs), a wireless terminal, and a central server. The remote monitoring system allows exchanging and gathering information between WSNs and the wireless terminal which includes a micro-controller unit (MCU) and a 3G M2M module, and the wireless terminal also communicates with the central server through TCP/IP connection. GUI is also supported in this central server, and it can display data from WSNs. For example, the real-time waveform, monitored data, and emergent event alarm will show on user's Internet devices which connect with central server. In order to ensure the accuracy of capturing data, synchronization and data analysis are considered in this system. This remote monitoring system embraces three characters. First, an expandable wireless terminal is developed, which can connect any WSNs with compatible serial interface. Second, the wireless terminal is implemented by the MCU and the 3G M2M module, and this system is more flexible comparing with commercial 3G modem. Third, the central server is convenient to read for user by providing many functions, such as real-time charting, file backup, event alarm and so on. The system is constructed and successfully tested for wireless sensor networks. There are two application designs according to this remote monitoring system. One is a remote power monitoring system for photovoltaic solar systems and wind generators, and another one is a remote healthcare monitoring of electrocardiogram. In the power monitoring system, the Microchip dsPIC30F MCU and Huawei EM770W M2M module are used to construct a wireless terminal, which transfers power information to the central server. The transmission range of wireless terminal is up to 5 km, and it also has the high data rate (7.2 Mbps downlink and 2 Mbps uplink). The power consumption of the wireless sensor node and the wireless terminal in active mode are about 198 mW and 2 W, respectively. In the healthcare monitoring system, the Android phone acts a wireless terminal. It can capture the ECG signal from a wireless sensor node which is wore on the patient, and transfer data to the central server. The power consumption of the wireless sensor node in active mode is about 336 mW.