MQ 6 Gas Sensor Module

The  MQ 8 gas sensor module is designed to detect levels of hydrogen gas (H2) in the environment. The MQ-8 gas sensor module is commonly used in applications such as gas leak detection, hydrogen gas monitoring in industrial settings, and hydrogen fuel cell monitoring.
The gas sensor is mounted on the PCB with TTL pins which makes it very easy to use it with controllers like Arduino, Raspberry PI, ESP, etc. with the simple help of jumper wires.

A flame sensor module is an electronic device used to detect the presence of flames or fire. It is commonly used in various applications such as fire detection systems, safety equipment, and industrial processes. The module typically consists of a sensor and supporting circuitry that helps in flame detection.
The flame sensor module works based on the principle of infrared (IR) detection. It uses an IR receiver to detect the infrared radiation emitted by flames. When a flame is present, it emits IR radiation that falls within a specific wavelength range. The sensor module is designed to detect this specific range of IR radiation and trigger a response.