Here's a detailed description of the MQ-6 gas sensor:

Working Principle: The MQ-6 sensor operates on the principle of a chemiresistor, where the resistance of the sensor's semiconductor material changes in the presence of specific gases. This change in resistance is then converted into an electrical signal for analysis.

Target Gases: The MQ-6 sensor is primarily designed to detect combustible gases such as propane, butane, liquefied petroleum gas (LPG), methane, and alcohol vapors. It has a high sensitivity to these gases, making it suitable for applications where gas leak detection is critical.

Structure and Components: The sensor is typically housed in a compact and durable package, making it easy to integrate into various systems. It contains a sensing element composed of a semiconductor material that interacts with the target gases. An internal heating element is included to maintain the sensing element at an optimal operating temperature for accurate detection.