How to make MQ2 gas sensor arduino project, Propane, Butane, Methane Alcohol detector

MQ 2 Gas Sensor
Detect the presence of flamable gases like
Methane, Butane, Propane, Alcohol etc.
Here in this project gas sensor
detect the presence of flamable gas in surrounding
if the level of gas goes beyond the threshold
value which is preset in code the Red LED
start glow and buzzer is activate and in safe condition
green LED is glowing and buzzer is deactivate

Link to download code :-
mediafire.com/?x9utr6yjit0jygc

Sensor connection:-
Gas sensor Arduino
A0-------------------------------A5
VCC----------------------------VCC(5V)
GND---------------------------GND

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