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Category: Inside Circuits Views: 4603 Rank: 10 A humidity sensor with temperature compensation built-in. Never apply a DC voltage to the sensor, even measuring the sensor with an ohmmeter will damage the device, always ensure that an AC voltage is applied. Avoid condensation, freezing, dust, mist, oil, alcohol, etc. To set up this circuit replace the H14DL with Min Res 22Kohm and Min Res 51Kohm as shown, Acjust RV1 until a voltmeter between output and ground reads 1.40V.  The output will then be as shown in the table to an accuracy of about ~5%. Datasheet file1: Click here to download BZY88C5V1.pdf datasheet. Datasheet file2: Click here to download 1N4148.pdf datasheet. Datasheet file3: Click here to download TL072.pdf datasheet.
Related circuits The VCO of Ul, a phased-locked loop. produces a low-frequency square-wave signal from 5 Hz to 2500Hz, which is controlled by varying the voltage to pin 9 via R2. The frequency threshold is set by Rl and Cl. Increasing the value of Rl increases the frequency, and decreasing the value of Cl... The DC output at Pin 1 vanes linearly with the RMS input at Pin 4. 2 CT is tweaked until the svnc signal is in phase with the AC signal. An ac voltmeter may be easily constructed. Simplicity of the circuit and low component count make it particularly attractive. The demodulator output is a... When Sl is off, Cl charges to within 0.5 V of the battery voltage through diode Dl and resistor R4. When Sl is closed, tbe anode of tbe PUT rises to the positive supply voltage. The PUT does not conduct, because battery voltage appears in series with tbe charge stored on Cl, which raises the... Power Supply Monitor /Memory Protector This circuit detects low-voltage supply conditions, down to 0.6 V. Dl sets the trip point of the cir Audio-Powered Tape Recorder Controller A tape recorder can be controlled by rectifying the audio input and driving an IRF511 power MOSFET t Invisible infrared pulsed laser The device generates an adjustable frequency of low to medium powered IR pulses of invisible energy and must be treated with care. The portable battery pack is stepped up to 200 to 300 volts by the inverter circuit consisting of Ql, Q2, and Tl. Ql conducts until saturated, at which time, the base... This circuit is suitable for fitting into slide projectors without a dimmer facility as witb 24-Vac fed halogen lamps. With a few small alterations, it can also be used for dimming 12-V halogen lamps, but not those in a car, because these are fed from a de source. The circuit shown in Fig.... Voltage Controlled Filter SSM2044P At this circuit the SSM2044 IC is used, a 4 pole voltage controlled filter designed for electronic music applications. On-chip voltage control of resonance allows direct and easy interfacing with programmers and controllers. The IC features extended control range, low noise, and high control... Humidity sensors
A Humidity Sensor Circuit For Arduino
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