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Overview In this tutorial, you will learn how to calibrate and use MQ9 gas sensor with an Arduino board. https://electropeak.com/learn/wp-content/uploads/2019/04/mq9-2.mp4 What You Will Learn What the gas sensor is and how it works. Comparison of different gas sensor models How MQ9 gas sensor works Using MQ9 gas sensor with Arduino https://youtu.be/yqr3q-LBEUY?t=22 What Is A Gas Sensor And How Does It Work? A gas sensor is a device that detect...