Cotton humidity detection circuit
Source: InternetPublisher:笑流年 Keywords: Humidity detection circuit BSP instrument transistor Updated: 2020/11/05
It consists of a multivibrator composed of transistors VTi and Vtz and an indicating instrument (microammeter,
the panel scale is changed to humidity value) PA. Capacitive humidity sensor C2 is used as the moisture detection component. C2 is actually a
small box made of insulating material. The lid and bottom of the small box are made of two metal plates. The small box can hold 100g of cotton.
Before measurement, first adjust the zero, that is, repeatedly adjust the potentiometer RP and the semi-variable capacitor C3. Make the indication of indicating instrument
PA
be 0ⅡA.
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