DIGITAL HUMIDITY METER AND HUMIDITY CONTROL CIRCUIT

摘要

The present invention is to provide a digital hygrometer capable of displaying accurate humidity without being influenced by the ambient temperature and the degree of contamination, and in particular, it is easy and easy to make IC by simplifying the interface circuit which converts the sensor value measured by the sensor into a digital value. This relates to a high digital hygrometer.;It also relates to a humidity controller using this digital hygrometer.;The present invention constitutes a sensor unit with a capacitor which is a capacitance humidity sensor whose capacitance changes according to absolute humidity and relative humidity, and detects the voltage according to the capacitance change of the capacitor with a Schmitt trigger circuit to change the digital value to the capacitor. It consists of a switch for switching the charging and discharging of the interface circuit part, the digital display of the 7-segment that displays the digital value of the interface circuit part to the outside, and by configuring the ON / OFF control, the simplest type of control method.