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Linear frequency output type humidity sensor and relative hu

2017-03-12 00:54  
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Linear frequency output type humidity sensor and relative humidity measurement circuit
Linear frequency output type humidity sensor and relative humidity measurement circuit is as shown. The power supply voltage UCC ranges from +3.5V to +12 V. Utilizing a CMOS timer TLC555, HS1100/1101 and resistors R2 and R4 are coupled to constitute a monostable circuit. Then the relative humidity is converted into frequency signal. The output frequency ranges from 7351 Hz to 6033Hz and its corresponding relative humidity is from 0 to 100%. When RH = 55%, f equals to 6660Hz. Output frequency signals can be sent to the digital frequency meter or SCM system for measuring and displaying the relative humidity values. R3 is the current limiting resistor of the output end, ensuring the protective effect.