Humidity sensor using 8051

Project Information

• This project is about a simple humidity sensor based on 8051 microcontroller.
• Humidity sensor is also called hygrometer.
• This circuit can sense relative humidity (RH)  from 20% to 95% at an accuracy of 5%.
• The humidity information is displayed on a 16×2 LCD display.
• A relay is also provided which is set to be active when the humidity crosses a certain trip point.
• The circuit is mains operated and it is very easy to install. DHT11 is the humidity sensor used here.