Research On The Signal Acquisition & Transmission System Of Multi-Parameter Water Quality Detector

Nowadays, water quality monitoring has become significant important because of serious water pollutions induced by the development of economics, the accelerated progress of urbanization and industrialization. The portable water quality detectors have the feature of small size, portability and flexibility, which multi-parameter detection is the developing direction. The signal acquisition and transmission technology was researched according to the requirement of multi-parameter detector, which will satisfy the increase of application requirement.The signal acquisition and transmission technology of the portable multi-parameter water quality detector was researched and the hardware and software of the system was designed, which initial realized signal acquisition and display for multi-parameters. Meanwhile, in order to satisfy the requirement of wireless data transmission for water quality network, the function of signal wireless transmission was developed . The detailed parts are listed as follows,①The present research status of portable water quality detectors was analyzed and the scheme of signal acquisition, display and transmission of portable multi-parameter water quality detector was proposed;②The signal acquisition hardware circuit of portable multi-parameter water detector was designed based on ATmega16, and the software of signal acquisition was fulfilled. The acquisition of temperature, pH, dissolved oxygen and conductivity signal was realized;③The display circuit of portable multi-parameter water quality detector was designed based on KS0724LCD dot-matrix liquid crystal display, and the LCD driving program was fulfilled. The real-time display of four parameters in the same page was realized;④The data transmission system was designed based on nRF905 radio frequency wireless chip, and the data transmission program was fulfilled. The wired and wireless transmission modes for portable multi-parameter water quality detector was realized;⑤Verification experiment of signal acquisition, display and data transmission was carried out.