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Wednesday, September 30, 2009

Humidity tester


This is a humidity tester.If you are conducting a flower nursery you can use this circuit to know the humidity of your green houses.and we can attach alarms for this.then it will show you that the humidity has changed so you can use this circuit to grow your plants under a control situation





Notes.

* The probes can be anything like iron nail.pin paper clip etc.
* To calibrate the circuit for particular density,insert the two probes to the required material and adjust R3 so that the LED glows.The LED will glow whenever the humidity of the testing sample becomes equal to this humidity level.
* A 3V battery can be used to power the circuit.
* Another general purpose NPN transistors like BC107,BC148,2N2222 etc can be also used for Q1.

1 Comment:

Ginger Sanches said...

The tester can be very helpful during the period of humid weather. By the way, the proofreading services can help you with writing.

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