Abstract
One of the main problems in recent years, air pollution, haze and so become an
everyday discussion, air pollution has led to a number of human health problems, and
this trend is getting worse. Sulphur dioxide is currently the most important pollutants
in the air, people are harmful sulfur dioxide monitoring efforts more and more
attention, there are many methods for monitoring sulfur dioxide gas. This design is
monitoring the concentration of sulfur dioxide in the air for an instrument that can be
used as a remote air concentrations of sulfur dioxide in the monitoring of
environmental monitoring.
A detailed description of the design principles of the current working methods are
often used to measure sulfur dioxide and electrochemical sensors used and operating
characteristics, features and performance are used STC90C51 microcontroller and
RS232 serial communication, AD converter, LCD principles The problems associated.
This section describes the zero calibration, calibration and calibration concentration
from program design, component selection, circuit design, process design, and
equipment of a complete thought. 90C51 core designed to achieve the purpose of the
measurement system to measure sulfur dioxide, the measurement results are displayed
with an LCD screen, and the host computer can communicate with the host computer
via a serial cable can also change the value of the instrument via serial line alarm,
alarm alarm based on pre-set alarm value.
Keywords: air pollution, sulfur dioxide; concentration; monitoring; STC90C51
