Digital temperature and humidity detection device

Abstract

The invention relates to a digital temperature and humidity detection device. The digital temperature and humidity detection device structurally consists of a temperature induction circuit A, a humidity induction circuit B, a two-way eight-position dial-up switching circuit C, an analog / digital (A / D) conversion circuit D, a reset circuit E, a central processor unit F, a crystal oscillator circuit G, a digital / analog (D / A) conversion circuit I, a loosening device and voltage / current protective circuit H and a temperature and humidity analog quantity output circuit J, wherein the temperature induction circuit A, the humidity induction circuit B, the A / D conversion circuit D, the central processor unit F, the D / A conversion circuit I, the loosening device and voltage / current protective circuit H, and the temperature and humidity analog quantity output circuit J form a main circuit; the two-way eight-position dial-up switching circuit C provides temperature and humidity compensation data during calibration of a temperature and humidity sensor; and the reset circuit E, the crystal oscillator circuit G and the central processor unit F are connected to provide necessary support for the work.

Description

Technical field: [0001] The invention relates to a temperature and humidity detection instrument, in particular to a digital temperature and humidity detection device. Background technique: [0002] The measurement and control of temperature and humidity is one of the important work objectives of many industries. Whether it is grain warehouses, Chinese herbal medicine warehouses, or book preservation, meteorological observation, scientific research, and the production and installation of special products, a specified temperature is required. And humidity, and with the rapid development of my country's industry, the occasions that need to control temperature and humidity are showing a rapid growth trend. However, temperature and humidity are the most difficult indicators to guarantee. In view of this situation, reliable, practical and high-precision Temperature and humidity detection system is very important. Although there are many types of temperature and humidity sensors in...

AI Technical Summary

Problems solved by technology

Although there are many types of temperature and humidity sensors in the prior art, the common deficiency in use is that the circuit design is not very reasonable, which is mainly reflected in the fact that the output accuracy of traditional temperature and humidity sensors is mainly calibrated by potentiometers and adjustable resistors. After work, the resistance values ​​of potentiometers, adjustable resistors, etc. will fluctuate, causing the output accuracy of temperature and humidity values ​​to gradually increase in deviation, so the measurement accuracy is difficult to guarantee, and linearity, repeatability, interchangeability, consistency Sex etc. are often unsatisfactory

And the lack of voltage and current overload protection, so it has a great impact on the use effect and service life of the temperature and humidity sensor

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