ZHANG Guo jie, CHEN Kai, YAN Zhi gang, WANG Wen hao

(School of Mechanical Engineering, Hangzhou dianzi University, Hangzhou 310000, China)

Abstract: Aiming at the existence of traditional water quality monitoring system in wiring trouble, high cost and low accuracy of the system, through the study of water quality monitoring system data communication mode, the sensor node hardware, sensor node software, quality information sensing elements, a wireless water environment monitor system based wireless sensor networks was designed, the system consists of water quality monitoring node of multi source information fusion, router node and upper computer monitor software. Water quality information was collected by the sensor nodes, the collected data was sent by a wireless sensor network node to the sink and the local PC monitoring center via RS232 serial port. High performance STM32 microcontroller was used in sensor nodes, industrial pH electrode, YDC100 oxygen electrode was used in sensor portion as the sensing element. Research on the real time monitoring of water quality for more than the alarm data, and be able to predict water quality warning function. The research results show that pH, dissolved oxygen and temperature average relative error of 4.06%, 3.10% and 0.85%, which meet the aquaculture water quality monitoring applications.

Key words: water quality monitoring; sensor; wireless networks; real time monitoring