Design of Portable formaldehyde detector

摘要

In this paper, a portable formaldehyde detector based on electrochemical sensor and single chip microcomputer is designed. During the detection, the gas containing formaldehyde diffuses into the sensor, reacts with the inner electrolyte and produces a weak current signal, which is converted into a voltage signal by the working circuit. The voltage signal is then input to A/D through the signal processing circuit, and the MCU is collected through A/D, and the signal is processed, and the operator is communicated through the key and LCD.