Arduino SMOKE/GAS SENSOR MODULE MQ2 (MQ-2) Introduction, specifications,interfacing and programming

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Gas leakage SMS Alert using gsm module:
• Arduino Gas leakage de...
Description:
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This Gas Sensor Module features an MQ-2 sensor. The MQ-2 sensor is a versatile gas sensor capable of detecting a wide range of gases including alcohol, carbon monoxide, hydrogen, isobutene, liquefied petroleum gas, methane, propane, and smoke. This module is provided with a male header interface and can be easily interfaced with Arduino/Mega using male to female type jumper wires.
Pinouts:
The 4 male headers are labeled with A0... D0...Gnd....and Vcc....
A0 is the Analog output of the sensor and should be connected with the analog pin of the Arduino Uno or Mega.
D0 is the digital output in the form of 5v or Gnd. The level can be adjusted using this variable resistor.
Gnd pin of this module will be connected with gnd of the Arduino or mega.
Vcc should be connected with 5 volts of Arduino or mega.
Applications:
They are used in gas leakage detecting equipment in family and industry, are suitable for detecting of LPG, i-butane, propane, methane, alcohol, Hydrogen and smoke.
Interfacing:
As you can see I have already connected 3 jumper wires, red is connected with VCC of the sensor module, black is connected with the gnd of the sensor module and white is connected with the analog output(A0) of the sensor Module...
So connect the red wire with 5volts of Arduino......
connect the Black wire with gnd of Arduino.......
and finally, connect the white wire with analog pin A1 of the Arduino.
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[@yawarsaeed6499]

Did you check MQ2 sensor for Kitchen Natural Gas leakage detection.
Please confirm.
Thanks

[@ElectroniClinic]

Yes

[@zakirjaufer2951]

Hi. Is it normal to get a smell when you connect the sensor to the Arduino for the 1st time? I get a slight smell and the sensor becomes slightly hot. This is even before I upload any coding

[@ElectroniClinic]

This has never happened to me.

[@andrewcandare9945]

do i have to preheat mq2 upon using it?

[@amitarathi8430]

why 230 is taken in this code plzz describe

[@renzocorcuera6811]

in this code, it can detect gas too? please answer. thanks

[@ElectroniClinic]

Yes

[@renzocorcuera6811]

@@ElectroniClinic thanks

[@baluchowdary1190]

Where can i get code?

[@ElectroniClinic]

It's on electroniclinic.com