MQ-4 Methane Gas Sensor Module

Features:

Suitable for home or factory methane gas, natural gas, and other monitoring devices.
Indication of the signal output.
With dual signal output. (Analog output, and TTL level output)
When TTL low output signal is light, it can be connected directly to the microcontroller.
When the concentration is higher, the analog output voltage (0 - 5V) is also become higher.
The module has better sensitivity for methane gas and the natural gas.