How to use gas sensor mq2 with arduino | mq2 gas sensor | arduino project |

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What is a Gas Sensor?
They are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration.

In this project, I have interfaced a Gas Sensor with Arduino. The MQ-2 Gas Sensor can detect various types of Gases along with Smoke.



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[MKRCLab]

Good video I subscribed but please try to explain how circuit/ code works

[PranaviNagar]

hie!
my buzzer is not working and after the sensor is detecting smoke, its not going back to green. it would be wonderful if you could help!

[papaimanna]

Brother can i use code from Chat GPT ??

[dishas]

Green led us switching on but the red led is not switching on even though we have passed smoke to the mq2 sensor...what is the issue?

[anusharm]

I uploaded a code green led is coming but gas sensor is not working and red led also not showing can u please help me

[febiamelya]

Is it active buzzer or passive buzzer?

[Dhakshini-tp]

Does it work for both gas, fumes, smoke

[navyadc]

Does this code only work for mq2 have used mq5 sensor but its not working so i asked...please reply it very helpful

[Dhakshini-tp]

Hook up wire means normal electrical current wire aa

[y.tj.info-]

can you make and share circuit diagram of this same work using arduino nano instead of arduino uno.

[niccii_]

can i make this project without breadboard?

[perumalofficial]

I connected the Arduino board in the pc and i have done all but it is not uploading

[abdullahtanveer]

Can jumper wire can be used in place of hookup wire

[satyanarayansahoo]

Brother my MQ2 sensor is not sensing the smoke, what should I do then??

[anenthsankar]

Bro i have an issue in this project
Buzzer is beeping and red light is glowing repeatedly in every 6 sec continuously!!!

What to do to solve this !??

[GayathriSingamsetty-pl]

Main.java:1: error: unnamed classes are a preview feature and are disabled by default.
int Input = A0;
^
(use --enable-preview to enable unnamed classes)
1 error
error: compilation failed this is an error sir can you help me with this

[manjit]

int Input = A0;

int Buzzer = A1;

int GreenLED = A2;

int RedLED = A3;

int value;

int MAX = 600;



void setup() {

Serial.begin(9600);

pinMode(Input, INPUT);

pinMode(RedLED, OUTPUT);

pinMode(GreenLED, OUTPUT);

pinMode(Buzzer, OUTPUT);

}



void loop() {

value = analogRead(A0);

if (value >= MAX) {

digitalWrite(GreenLED, LOW);

digitalWrite(RedLED, HIGH);

digitalWrite(Buzzer, HIGH);

delay(5000);

digitalWrite(Buzzer, LOW);

delay(6000);

}

else {

digitalWrite(RedLED, LOW);

digitalWrite(Buzzer, LOW);

digitalWrite(GreenLED, HIGH);

}

}