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how humidity sensor will make using 8051 microcontroller. and also gave code of this sensor.
The value of homework comes from doing it yourself.
It's a trick question.
The 8051 does not have the power to do the job.
Use that as your answer and your professor will be very impressed.
When you wanted a degree in STEM, but took one in Antiquities and Archeology...
The 8051 does not have the power to do the job. male cow manure
People having been measuring humidity for millennia - it's not a new or novel thing. Therefore you should be able to find descriptions of the well-established techniques for measuring humidity in any standard textbook or reference - and, of course, on the internet.
Rather than make a humidity sensor completely from scratch, do you really mean that you want to use one of the many commercially available sensors, and connect it to your 8051?
Your homework then becomes a standard interfacing task: www.8052mcu.com/.../160143