Study On Groundwater Monitoring System Based On SCM

The water resources are human society's precious wealth. It is essential in the life, the industry and agriculture production. With the world population growth and the industry and agriculture production development, the water demand is growing day by day. The water already changed more preciously than any time. But humanity's production and life cause the pollution of water body, the water quality to be worsen and cause the limited water resources to be more anxious. So, for saving the limited water resource, it is necessary to monitor tne Groundwater.This article views the resolution of the multiparameter ground water monitoring system, configuration and character. The whole collected system has finished the detection of water height,water temperature specific conductivity etc parameter of the ground water. And, if necessary, it can be mangnified the amounts of the parameter. The system uses the different sensors, and changes the form of groundwater parameter from physical quantity into electrical singnals. Those electrical singnals are signified by former magnify circuit, and it was turned into suitable amplitude. Then, through filter circuit the disturbing signal in the other frequency was erased after the electrical singnal mangnified by former magnify circuit, then it was taken analogue to digital conversed after magnified by second magnify circuit. Changed digital singnal was taken to microprocessor. The microprocessor uses AT89C52 SCM which makes the system intelligentized. The data cannot lose since the unique data storage function after the electrical is cut. We can also inquire the historical data.AD623, a kind of instrtunentation amplifier, which has the characters about low temperature float,low power loss,high precision, was applied at the first-class measurement circuit, and adapt to the situation as battery power supply,portable due to small size,low power and loss particularly. Multi-way analog switch MAX308 was used, it causes the system deals with multi-way signal which after pre-amplification Multi-way signal. The transformer is AD7705 which is the type of∑-△made in company AD in America, it is high precision one. It can directly receive electrical signal and output digital signal. For recording measure time, real-time dock is needed. The system selects DS 1302 chip.In the design of SCM's optitude measure control system, the function of the data cannot lose after the electrical is cut, the function of watchdog, the function of power-on and power-fail, the function of power supply voltage inspecting, it is allimportant to the system. The X25045 chip was produced of USA Xico company has the function above, this assembled greatly predigest hardware design, improving dependability of the system, reducing the request of printed board's space, reducing cost and power consumption. In the control of AT89C52, the system have the data processing of give an alarm,display and put a seal on etc. The slave computer was the smart instrument under the control of microprocessor, it have the advantage of economy in electricity, the slight volume, low cost, the work reliable. This instrument is the ground water monitor system which a set suits the open country field use, carries convenience.