How TO USE MQ2 GAS SENSOR WITH ARDUINO FOR SMOKE DETECTION.

In this tutorial we demonstrate how to interface the MQ2 gas sensor with Arduino to make a simple smoke detector.
Subscribe to my channel: bit.ly/2LiMpF0
==========Recommended products from Amazon :=========
i). Wavesahre MQ-2 Gas Sensor Module LP,Propane,Hydrogen Detection Sensor Gas Detector Sensor Module for Arduino Raspberry pi: amzn.to/34aZwwM
ii). 9PCS/Lot Gas Detection Sensor Module MQ-2, MQ-3, MQ-4, MQ-5 MQ-6, MQ-7, MQ-8, MQ-9, MQ-135 Sensor Module Gas Sensor Starter Kit: amzn.to/37r6W1d
For Schematics and code visit the link: mytectutor.com/how-mq2-gas-se...
DISCLAIMER: This video description contains affiliate links. If you buy any item using these product links, I may receive a small commission. I would appreciate your support in this way!

[@ajaykalsi6007]

thankyou so muck great video also i have a question for your video using A I2C LCD WITH ULTRASONIC SENSOR can you add like for the library lcd bar graph

[@sivakumarc3853]

Hiii.....this tutorial was awesome...thank you.....how to do this in proteus ..please help me...also how to give the input to the sensor instead of logic toggle since it is 0 and 1 only

[@rrshorts7373]

Sir can we use same connection and code for mq135 sensor

[@kennmarkeay6193]

verry nice

[@Dancopymus]

First of all, thanks for the video.
Is this sensor reliable? I would like to take advantage of your code and add it with another code with DHT22 Temperature and Humidity sensor, for example, while there is no detection of gas and/or smoke, showing Temperature and Humidity on the LCD screen. Do you have something like that or could you give me a hint on how to do it? Thank you

[@mytectutor]

This sensor is quite good for smoke detection. About your other idea it’s just a matter or adding the libraries for the dht11. However you may need a larger lcd to be able to display all the readings for temperature, humidity and the state of the smoke sensor properly. I have a tutorial on the dht11 where u can make reference

[@Dancopymus]

@@mytectutor Thank you, I'll take a look. But, what I need is for gas leak detection.

[@markofficialvlog3415]

@@mytectutor Sir can you explain how to adjust the sensetivity of MQ 135 ?

[@jowwww]

Without i2c.work?

[@williamchupin4842]

here is the code again if you are getting errors
#include
#include
LiquidCrystal_I2C lcd(0x27,16,2);
#define MQ2pin (0)
int buzzer = 10;
int sensorValue; //variable to store sensor value
void setup()
{
pinMode(buzzer, OUTPUT);
lcd.begin();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print(" GAS SENSOR ");
delay(1000);
lcd.setCursor(0,1);
lcd.print(" WARMING UP ! ");
delay(100); // allow the MQ-6 to warm up
}
void loop()
{
lcd.clear();
sensorValue = analogRead(MQ2pin); // read analog input pin 0
lcd.setCursor(0,0);
lcd.print("VALUE: ");
lcd.print(sensorValue);
lcd.print("ppm");
if(sensorValue > 300)
{
lcd.setCursor(0,1);
lcd.print("SMOKE DETECTED");
tone(buzzer, 500, 2000);
}
else
{
lcd.setCursor(0,1);
lcd.print(" NO SMOKE");
noTone(buzzer);
}
delay(2000); // wait 2s for next reading
}

[@kixbix3292]

Can you please provide library l2C Lcd zip file for this?its giving me error

[@mohamedsameerah1383]

I have a doubt y arduino... This work smoke detector does rgt... Bcoz of digital number

[@zzpotato1238]

Anyone know why I can't run the code on Arduino software. It's say I cannot detect the #INCLUDE liquid crystal name

[@KenanPolat]

program code?

[@rauljurado4534]

Hi,
I have the error:
'POSITIVE' was not declared in this scope
Any idea of how to solve it ?

[@kixbix3292]

I m gng to try this project ! Does this run good efficiently ?? Please do reply

[@beysik6871]

same positive

[@williamchupin4842]

#include
#include
LiquidCrystal_I2C lcd(0x27,16,2);
#define MQ2pin (0)
int buzzer = 10;
int sensorValue; //variable to store sensor value
void setup()
{
pinMode(buzzer, OUTPUT);
lcd.begin();
lcd.backlight();
lcd.setCursor(0,0);
lcd.print(" GAS SENSOR ");
delay(1000);
lcd.setCursor(0,1);
lcd.print(" WARMING UP ! ");
delay(100); // allow the MQ-6 to warm up
}
void loop()
{
lcd.clear();
sensorValue = analogRead(MQ2pin); // read analog input pin 0
lcd.setCursor(0,0);
lcd.print("VALUE: ");
lcd.print(sensorValue);
lcd.print("ppm");
if(sensorValue > 300)
{
lcd.setCursor(0,1);
lcd.print("SMOKE DETECTED");
tone(buzzer, 500, 2000);
}
else
{
lcd.setCursor(0,1);
lcd.print(" NO SMOKE");
noTone(buzzer);
}
delay(2000); // wait 2s for next reading
}

[@williamchupin4842]

@@beysik6871 i posted the working code

[@williamchupin4842]

@@kixbix3292 i posted the working code

[@gerogecluney4860]

These aint ppm values!