Air Quality Monitoring System

This IoT device is use to identify the Air quality,temperature and humidity and it use to analysis and monitoring the air quality in a particular environment and the analyzed data is send to the enduser using android application. The data are collected from the nodeMCU and it stored on the cloud sever.

This Device is use to sense the Temperature, Humidity and Air quality of the particular environment and make the exhauster fan and Buzzer automatic ON when temperature and air quality is HIGH and automatic OFF when Temperature and air quality is LOW and it indicate the maximum level for the user. The exhauster fan vary its speed according to the environment.

COMPONENTS:

MQ135 gas sensor
DHT11
BreadBoard
nodeMCU
Jumber wire

SOFTWARE & SERVICES :

MQ135

Air quality sensor for detecting a wide range of gases,includingNH3, NOx, alcohol,benzene, smoke and CO2.

Ideal for use in office or factory. MQ135 gas sensor has high sensitivity to Ammonia, Sulphide and Benze steam,also sensitive
to smoke and other harmful gases.


features:

Operating Voltage is +5V
Detect/Measure NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
Analog output voltage: 0V to 5V
Digital output voltage: 0V or 5V (TTL Logic)

DHT 11

The DHT11 is a basic, ultra low-cost digital temperature and humidity sensor. It uses a capacitive humidity sensor and a thermistor to measure the surrounding air, and spits out a digital ignal on the data pin (no analog input pins needed). Its fairly simple to use, but requires careful timing to grab data.

Block Diagram:

Flow Diagram: