Humidity detection circuit diagram composed of H104R humidity sensor

Published:2011/8/15 1:09:00 Author:Ecco | Keyword: Humidity detection , humidity sensor | From:SeekIC

Figure 1 is the humidity detection circuit composed of H104R humidity sensor. In the circuit, the AC voltage is added to the humidity sensor, and the circuit consists of the oscillation circuit, buffer, rectifier circuit, temperature compensated differential amplifier circuit, humidity output amplifier circuit, temperature detection circuit,temperature output amplifier circuit. The circuit's power supply voltage is ± l2V, the oscillation frequency of the oscillation circuit is 1KHz. Compensation characteristics of the sensor is decided by R1, R2, R3. The temperature coefficient of RH humidity resistor H104R is 0.7% RH / ℃. Thermistor RT is commonly used in temperature compensation circuit.



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