ABSTRACT
With the development of our country's economy, the improvement of people's living
standards,people increasingly focus on environmental issues and health problem, and
indoor air quality problems also paid close attention to by the people.Generally,each of us,
on average, two-thirds of the time spent indoors.The paper mainly designs a system that
used for detecting of indoor air quality With testing and transfinite alarm function.The
main solution is based on 51 single chip microcomputer as control core,choose the digital
temperature and humidity sensors and MQ-5 formaldehyde gas sensors.Standard of sensor
output signal through the core of AD0832 after A/D conversion circuit, by single-chip
computer for data processing, finally by the LCD display the corresponding values.Design
the alarm system at the same time, realize timely alarm when parameters exceed bid.Indoor
air testing system of small size, low power consumption, simple operation, it’s suitable for
application in family and community health care, which to know the indoor air quality in
real time.
Key words: 51 single chip microcomputer; Indoor air testing; A/D conversion; The
LCD display
