Abstract
As the formaldehyde present in people's daily life, and when the air exceeds a certain amount of formaldehyde, the body will cause harm, so the design of practical, biased detector carried by the people's attention.
The indoor formaldehyde detection module of the building design to control the microcontroller core, with data processing, numerical display and alarm functions exceeded. The design is based on the principle of formaldehyde electrochemical sensors, the principle is the air oxidation of formaldehyde on the electrode reactions occur, the resulting current and the air diffusion electrode proportional to the concentration of formaldehyde, by detecting the amplification circuit and the adjustment of magnification by A / D conversion evacuation microcontroller, to detect and control by the MCU on-site show concentrations of formaldehyde.
The detection system can be divided into: air formaldehyde concentration measurement modules, data acquisition, processing module, the keyboard input module, display module and alarm module. Formaldehyde detection module by the formaldehyde sensors, data acquisition and processing module consists of AT89C51 MCU structure, the main LED display module form.
Keywords AT89C51 MCU ; Formaldehyde testing; A / D conversion