Air humidity measurement method with low power consumption

Abstract

The invention discloses an air humidity measurement method with low power consumption. The method comprises the following steps of: allowing a fixed resistor and a humidity-sensitive capacitor to form a resistor-capacitor (RC) circuit, allowing the RC circuit, a comparator in a microcontroller chip and a timer module to form a measuring circuit, and respectively measuring count values of a timer in two humidity states when the humidity-sensitive capacitor is charged to certain voltage and an output end of the comparator in the microcontroller chip produces input capture interruptions of the timer in a standard humidity environment; and saving humidity values and the corresponding count values in a storage of equipment, and effectively establishing the linear relation between the humidity and a count value, so that a measured practical humidity value is accurately calculated according to the measured count value in the practical use. The measurement method is simple, low in cost and power consumption and high in measurement accuracy, precision values can be adjusted according to application requirements, the self-correction can be performed, and the industrialized batch production of temperature and humidity instruments are convenient.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a method for measuring air humidity by a microcontroller and a humidity sensitive capacitor. Background technique [0002] In real life, the measurement of humidity is closely related to industrial production and people's life. It is usually necessary to detect and analyze humidity in various environments for scientific research, meteorological monitoring, industrial control and production, etc. Usually, the humidity measurement and recording device needs to be able to work in any environment at will, and has high requirements on the power consumption of the device. For example, the device needs to be able to work normally for several months or years in the battery state. [0003] Humidity measuring and recording devices currently on the market mainly use microcontrollers and integrated sensors SHT1X and DHT1X to measure humidity. Although the SHT1X and DHT1X sensors can di...

AI Technical Summary

Problems solved by technology

Although the SHT1X and DHT1X sensors can digitally output measurement results with an accuracy of 2% to 5%, they are expensive and require a few milliseconds to tens of milliseconds for a measurement. A specific type of sensor measures the humidity resolution fixed

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