Here's an overview of the MQ-5 sensor module:

Purpose: The MQ-5 sensor module is designed to detect gases like methane and LPG, making it valuable for applications where gas leakage needs to be monitored.

Sensitivity: It has a high sensitivity to methane and LPG gases.

Principle: The sensor operates on the principle of a semiconductor gas sensor, where the resistance of the sensing material changes based on the concentration of the target gases.

Features:

Analog and Digital Output: Similar to other MQ series sensors, the MQ-5 module provides both analog and digital outputs. The analog output can be used to estimate the gas concentration, while the digital output can be configured to trigger alerts when gas concentration surpasses a predefined threshold.

Adjustable Sensitivity: Many modules come with a potentiometer that allows users to adjust the sensor's sensitivity.

Affordability: The MQ-5 sensor module is cost-effective, making it a popular choice for gas detection projects.

Using the MQ-7:

Powering the Sensor: The sensor usually requires a 5V DC power supply.

Calibration: To achieve accurate readings, calibration may be necessary. This involves exposing the sensor to clean air to establish a baseline resistance value.

Reading Values: Like previous MQ series sensors, you can use a microcontroller (such as Arduino) to read values from the MQ-5 sensor. Connect the analog output to an analog pin and the digital output to a digital input pin on the microcontroller.