Design And Realization Of Ground Water Level Monitoring Smart Terminal Based On Embedded Technology

The shortage of water source is a major problem of China. Real-time monitoring of groundwater level can not only prevent overexploitation of water source, but also provide the basis for the government. The manual monitoring approach can not meet the monitoring requirements of a wide range of high accuracy. The monitoring equipment developed in embedded technology can not only save a lot of manpower and resources, but also realize the real-time monitoring of water level data and provide accurate and reliable data for analysis.There are following problems in the current groundwater monitoring:difficulties to take power, poor stability of rural power grids, poor working conditions, premature of sensors. Normal data transmission distance is short and the amount of data storage is small. In response to these issues, the terminal used battery as power supply, monitored each other by dual CPU mode, reduced the crash probability by hard reset of the device, used SD card to solve data storage problems, designed Power-on timer control circuit to solve the phenomenon of equipment crash. Sensor power control circuit was designed to protect terminal and extend the sensor life. And both wired and wireless transmissions were designed. The WinCE operating system kernel customization and transplantation was studied. The application of the control system module was designed based on WinCE operating system. And the program was designed for sampling module. The whole system is made up of three modules, the control system module, the sampling module and communication module. The control system module controls sampling module, receiving the water level data through serial port. It also controls the communication module to achieve the GPRS wireless communication. The sampling module is used to achieve the water level data through sensor. On receiving control commands the sampling module send the data to the control system module. The communication module uses SIM900to design the hardware circuit, and achieve serial communications with control system module.The innovation of this paper is the master-salve dual-CPU architecture, hard reset in the event of a crash situation, design of the sensor power control circuit to extend sensor life. Internet and GPRS wireless transmission can be achieved in two ways. By testing system power consumption, accuracy and stability of data acquisition, stability of data transmission and sensor power supply control circuit, stability and accuracy can meet the requirements of wireless communication. The system was proved feasible.