LPC1768 based temperature and humidity controller

Abstract

The invention discloses an LPC1768 based temperature and humidity controller, which comprises an acquisition unit, a control unit and an input / output unit, wherein the acquisition unit is used for acquiring the temperature and humidity in the environment; the control unit sends an operation instruction to the input / output unit according to the real-time operating state transmitted by the acquisition unit, and the control unit comprises a human-computer interaction display unit, an LPC1768 controller and a communication interface unit, and the LPC1768 controller is connected with the human-computer interaction display unit through the communication interface unit; the input / output unit controls an execution mechanism to operate according to an execution instruction of the control unit, andthe input / output unit comprises a control relay, an SSR and a servo valve; and the control unit is connected with the acquisition unit and the input / output unit through the communication interface unit. The LPC1768 based temperature and humidity controller is stable in signal, high in temperature and humidity acquisition accuracy, stable in output, rapid in response and free of the phenomena of lag and delay and has high temperature and humidity control accuracy and excellent control quality. In addition, the LPC1768 based temperature and humidity controller is wide in adaptability and low incost.

Description

technical field [0001] The invention relates to the technical field of test and measurement, in particular to an LPC1768-based temperature and humidity controller with high temperature and humidity acquisition accuracy, precise temperature and humidity range control, stable output, and rapid response. Background technique [0002] From the perspective of the development process of industrial temperature and humidity controllers, it can be roughly divided into three generations: the first generation of temperature and humidity controllers is a fixed value switch control mode, and its basic method is to use sensors to detect the humidity and humidity in the system. When the temperature and humidity values ​​are higher, the controller will disconnect the mechanical and electrical switches to control the heating source and humidifier on and off. At present, this kind of controller is still useful in some occasions that do not require high control precision. Since this type of c...

AI Technical Summary

Problems solved by technology

[0003] At present, the controllers used in constant temperature and humidity testing machines on the market are mostly second-generation controllers, and the control effect of a few nominal self-tuning controllers is not satisfactory.

Manufacturers will over-promote the performance indicators of their products, and sometimes only give short-term indicators, or optimal indicators, or give a good measurement uncertainty without long-term verification

What's more, the controllers of some manufacturers will use the way of increasing the filter coefficient to display false control results

At the same time, due to the aging technology of the existing controllers, the update speed is slow, and the human-computer interaction experience is not emphasized, so it is difficult to meet the diverse needs of customers in actual production.

[0004] At present, there is still a certain gap in the performance of domestic temperature and humidity controllers compared with foreign temperature and humidity controllers. The biggest difference between them is mainly in the control algorithm. Low precision and poor adaptability

There are many reasons for this deficiency, such as for different control objects, the control accuracy is unstable due to the lack of control algorithms

[0005] In view of the above shortcomings, a new type of temperature and humidity controller is currently needed to solve the shortcomings of low control accuracy, poor adaptability, slow response, poor human-computer interaction experience, etc., to meet market demand

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