Hi seekers! Welcome to another article discussing a sensor from the MQ gas sensor series. Today, we are discussing the MQ-9 gas sensor, which can detect gases like carbon monoxide, CH4, and LPG. It has a long life and a simple structure, and the heart of this gas sensor is the sensing element on the heating circuit. Usually, such sensors are part of large projects where they sense the target gas and send a signal for any alarming condition.We’ll begin the discussion with the basic introduction of this sensor in which we’ll discuss the basic parts and their duties. After that, we’ll move toward ...