Tuesday, October 13, 2015

Interfacing of Humidity Sensor with 8051 Microcontroller

Humidity sensor works on the principle of relative humidity and gives the output in the form of voltage. This analog voltage provides the information about the percentage relative humidity present in the environment.

The relative humidity as follows:                       
The analog output of sensor is connected to ADC to get its corresponding digital value. The reference voltage of ADC is set to 1.5 volts. The digital values are received   at port of microcontroller.  These digital values are used to calculate percentage relative humidity of environment. 

Humidity is the presence of water in air. The amount of water vapor in air can affect human comfort as well as many manufacturing processes in industries. The presence of water vapor also influences various physical, chemical, and biological processes.

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