Intelligent temperature-humidity electronic measuring system based on SHT sensor

Abstract

The invention discloses an intelligent temperature-humidity electronic measuring system based on an SHT sensor. The intelligent temperature-humidity electronic measuring system comprises an input unit, a control unit and an output unit. The input unit comprises an SHT intelligent temperature-humidity sensor, a keyboard and a clock chip, wherein the SHT intelligent temperature-humidity sensor is used for acquiring temperature and relative humidity data; the keyboard is used for emitting an artificial control signal to the control unit; and the clock chip is used for generating real-time data. The control unit is used for receiving the temperature-humidity data of the SHT intelligent temperature-humidity sensor, the artificial control signal and the time data of the clock chip, and feeding the treated control output signal to the output unit after calculating and treating the data. The output unit comprises an alarm circuit and a display circuit, wherein the display circuit is used for displaying real-time temperature-humidity information and the time information; and the alarm circuit is used for carrying out alarming according to the output signal of the control unit. The intelligent temperature-humidity electronic measuring system has the advantages of being compact in structure, low in cost, good in portability, high in measuring precision and good in reliability.

Description

technical field [0001] The invention mainly relates to the field of temperature and humidity measurement equipment, in particular to an intelligent electronic temperature and humidity measurement system based on an SHT sensor. Background technique [0002] At present, the temperature measurement technology mainly develops metal thermistors, such as copper resistors, nickel resistors, platinum resistors, etc., which generally have shortcomings such as low sensitivity and poor measurement accuracy; when the length of the transmission line is not equal, there is still a need for temperature compensation. And other issues. Traditional humidity measurement generally uses dry wet bulbs and hair hygrometers, but they have defects such as low measurement accuracy and easy to be affected by ambient temperature and other conditions. Sensors with integrated temperature and humidity measurements are rarely used. [0003] The existing intelligent and accurate measurement system integra...

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Problems solved by technology

[0017] However, in the above scheme, the existing temperature measurement generally uses a negative temperature coefficient thermistor (NTC) as a temperature measuring device, and the humidity sensor generally uses a humidity sensor or a resistor. This structure determines that it has a fatal problem of poor linearity. Disadvantages, resulting in the need for temperature compensation at the cold end during temperature measurement

Due to this limitation, the temperature measurement system designed with this temperature measurement device requires a more complicated temperature compensation mechanism, and additional AD converters are required.

These lead to complex circuit design, bulky volume, low sensitivity, poor measurement accuracy, poor application effect, and high cost

[0018] Moreover, the existing temperature and humidity measurement systems are generally designed with discrete components for temperature and humidity, which leads to the complexity of system sampling, A conversion, signal amplification, line wiring and interface circuits, etc., resulting in the failure of the entire system. The cost and volume are relatively large, which cannot meet the applications in some places with narrow spaces and inside precision instruments.

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