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5.1 Introduction to project

Aim of the Experiment :

To make Air Pollution Monitoring using NodeMCU and MQ135 Gas Sensor.

Minimum Requirement :

  • USB Cable

  • NodeMCU ESP8266

  • MQ135 gas sensor

  • Bread Board

  • Jumper Wire

What is Gas sensor MQ135?

The MQ-135 Gas sensor can detect gases like Ammonia (NH3), sulfur (S), Benzene (C6H6), CO2, and other harmful gases and smoke. Similar to other MQ series gas sensors, this sensor also has a digital and analog output pin.

Schematic diagram :