Abstract
With the continuous improvement of people's living standards, more and more people pay attention to their quality of life and health, and the awareness of indoor air quality has been greatly enhanced. Formaldehyde is one of the most important substances in many indoor air pollutants. It mainly comes from plywood and pigments which is used in interior decoration. Therefore, the detection of formaldehyde gas is particularly important. To realize the monitoring of indoor formaldehyde gas concentration, an automatic formaldehyde monitor is designed in this paper. The article uses STM32F107 single chip microcomputer to control system. First, a Dart sensor is used to collect formaldehyde signals. Then, the signal is amplified and processed by the LTC1049 data processing module circuit. On the one hand, the real-time value of formaldehyde concentration can be displayed by LCD12864. On the other hand, when the formaldehyde concentration exceeds the preset threshold, the buzzer will sound the alarm. Finally, the system realizes the real-time monitoring of indoor formaldehyde concentration. In order to improve the measurement accuracy, the method of piecewise linear interpolation is used to correct the data. The experiment shows that the system has the advantages of good real-time, convenient operation, stable performance and intelligent. The system can be widely used in the monitoring of formaldehyde content in indoor air.
