AIR QUALITY MONITORING DEVICE

Abstract

The project operation depends on the switching mechanism of industrial loads for repeated operations with the help
of a user programmable logic control device. The project uses FOUR SENSORS and a microcontroller of 8051
family that operates the loads in three modes: set, auto and manual mode. Programmable logic controllers used in
industrial applications are very expensive for simple operations like consecutiveswapping of lots. In this project we
shows the functioning of this simple operation using a microcontroller of 89S52 family. In industries, there are many
Gases like co2 and no2.The excess of gases is harmful for the industry. So with the help of gas sensors we can
control the industrial unit. If the gas exceeds its limit then buzzer will buzz for 15 sec. If within a 15 sec it controls
then no any chances of damage but after the 15 sec there is lots of chances of damage then the relay driver circuit
will directly auto off the main power and save the industry accident.