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<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGZqScjvD8qnjyCfKkIVeWJb8_nSsCKbyLQgsu1mGTbyI3haGgFsAWdXQ8lX5nPmrisR0dQcBKVkTfr9fRNyPtjsS5A9u1VkBu08n9aiy-WAG9x9U4dn5HHQtIO9JoQ9bw79ls0PioyXST/s575/MQ-4+Sensor.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="575" data-original-width="474" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgGZqScjvD8qnjyCfKkIVeWJb8_nSsCKbyLQgsu1mGTbyI3haGgFsAWdXQ8lX5nPmrisR0dQcBKVkTfr9fRNyPtjsS5A9u1VkBu08n9aiy-WAG9x9U4dn5HHQtIO9JoQ9bw79ls0PioyXST/w330-h400/MQ-4+Sensor.png" width="330" /></a></div> MQ-4 sensor is a gas detecting sensor. This sensor is mainly
use to detect Methane, and CNG Gas. This sensor also sensing  other flammable gases like Butane and
propane. Good sensitivity to Combustible gas in wide range. High sensitivity to
Natural gas / CNG. Low sensitivity to smoke, flame. Long life and low cost.
Simple drive circuit.<o:p></o:p><div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFqRr3C1ZFnmltEr-mSql8SK9wLyJ8ovnlPdkXlQi5p0YHMPzSAEuf-xOFK3cT6XXTTwFcMXVhPKZkaboY_KzEEy1OTioeDLH8FAfta7DsOzBdvTPdJ5yX_9RYPT2ZeAys8QAdN5ULjyUy/s2048/MQ-4+Sensor+back.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1150" data-original-width="2048" height="225" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgFqRr3C1ZFnmltEr-mSql8SK9wLyJ8ovnlPdkXlQi5p0YHMPzSAEuf-xOFK3cT6XXTTwFcMXVhPKZkaboY_KzEEy1OTioeDLH8FAfta7DsOzBdvTPdJ5yX_9RYPT2ZeAys8QAdN5ULjyUy/w400-h225/MQ-4+Sensor+back.jpg" width="400" /></a></div>

There are different MQ series sensor which is used for
detecting different gases.<o:p></o:p>

List of different  MQ
series sensor are given below.<o:p></o:p>

MQ-2      Methane,
Butane, LPG, Smoke.<o:p></o:p>

MQ-3     Alcohol,
Ethanol, Smoke<o:p></o:p>

MQ-4     Methane, CNG
Gas<o:p></o:p>

MQ-5    Natural gas,
LPG<o:p></o:p>

MQ-6     LPG, butane<o:p></o:p>

MQ-7     Carbon
Monoxide<o:p></o:p>

MQ-8      Hydrogen Gas<o:p></o:p>

MQ-9       Carbon
Monoxide, flammable gasses<o:p></o:p>

MQ131    Ozone<o:p></o:p>

MQ135    Air Quality<o:p></o:p>

MQ136    Hydrogen Sulphide gas<o:p></o:p>

MQ137     Ammonia<o:p></o:p>

MQ138     Benzene,
Toluene, Alcohol, Propane, Formaldehyde gas, Hydrogen<o:p></o:p>

MQ214     Methane,
Natural Gas<o:p></o:p>

MQ216      Natural
gas, Coal Gas<o:p></o:p>

MQ303A   Alcohol,
Ethanol, smoke<o:p></o:p>

MQ306A    LPG, butane<o:p></o:p>

MQ307A   Carbon Monoxide<o:p></o:p>

MQ309A   Carbon
Monoxide, flammable gas<o:p></o:p>

<o:p> </o:p>

The connections of
MQ4 Gas Sensor Module.<o:p></o:p>

VCC to 5V DC<o:p></o:p>

GND to GND<o:p></o:p>

AO to AnalogO<o:p></o:p>

DO to DigitalO<o:p></o:p>

<o:p> </o:p>

<h2 style="text-align: left;">MQ-4 Sesnsor  with simple electronic circuit:</h2>

Components :<o:p></o:p>

1: MQ- 4 Gas Sensor.<o:p></o:p>

2: LED<o:p></o:p>

3: Buzzer<o:p></o:p>

4: Resistors  1.5 Ohm,
270 Ohm.<o:p></o:p>

5: Bread board<o:p></o:p>

6: Some jumper wires.<o:p></o:p>

7: DC Power source 5v.<o:p></o:p>

Circuit:<o:p></o:p>

<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAoGAGr0bUKrwS1UJpOLWMZMSYAnXJ_tdpRiYi3zZZRggbUt89vXBvrBIYy2OLlusSAIsEIZigEjsE8am41k79b1fTTxbE7WjKIYqF9E_q0Lgoqa2bl9BX127pGmb09MugE3ZR1ttujBME/s2048/MQ-4+Sensor+without+Arduio.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1152" data-original-width="2048" height="225" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEgAoGAGr0bUKrwS1UJpOLWMZMSYAnXJ_tdpRiYi3zZZRggbUt89vXBvrBIYy2OLlusSAIsEIZigEjsE8am41k79b1fTTxbE7WjKIYqF9E_q0Lgoqa2bl9BX127pGmb09MugE3ZR1ttujBME/w400-h225/MQ-4+Sensor+without+Arduio.jpg" width="400" /></a></div> <div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwFgeTPD8a37B3xcwsHEdbRH-ngZITY70aQLJQ9B1_vQzom8XmAkqKdZSmp7_sk9kHkMreaZ5ryxrKihGCvWkir8TGpi4IfRJssL95uECbMmPDSCFvn96W_ou108I7y5Yc3rgS4Z27vVMk/s324/MQ-4+Sensor+circuit.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="324" data-original-width="269" height="400" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiwFgeTPD8a37B3xcwsHEdbRH-ngZITY70aQLJQ9B1_vQzom8XmAkqKdZSmp7_sk9kHkMreaZ5ryxrKihGCvWkir8TGpi4IfRJssL95uECbMmPDSCFvn96W_ou108I7y5Yc3rgS4Z27vVMk/w333-h400/MQ-4+Sensor+circuit.png" width="333" /></a></div> <div class="separator" style="clear: both; text-align: center;"> </div><h2 style="text-align: left;"> MQ-4 Sensor with Arduino:</h2><div>You can also use MQ-4 sensor with Arduino. This sensor gives
you both digital and analog data.</div><o:p></o:p>

Using with arduino is very simple I am sharing both circuit
and Code for arduino.<o:p></o:p> Code:                              /* MQ-4 Methane Sensor Circuit with Arduino */ const int AOUTpin=1;               //the AOUT pin of the MQ-4 sensor goes into analog pin A1 of the arduino.const int DOUTpin=7;              //the DOUT pin of the MQ-4 sensor goes into digital pin D7 of the arduino.const int ledPin=13;             //the anode of the LED connects to digital pin D13 of the arduino Same for buzzer. int limit;int value; void setup() {Serial.begin(115200);            //sets the baud rate.pinMode(DOUTpin, INPUT);        //sets the pin as an input to the arduino.pinMode(ledPin, OUTPUT);        //sets the pin as an output of the arduino.} void loop(){value= analogRead(AOUTpin);      //reads the analaog value from the MQ-4 sensor's AOUT pin.limit= digitalRead(DOUTpin);     //reads the digital value from the MQ-4 sensor's DOUT pin.Serial.print("Butane value: ");Serial.println(value);           //prints the Butane value.Serial.print("Limit: ");Serial.print(limit);             //prints the limit reached as either LOW or HIGH.delay(100);if (limit == HIGH){digitalWrite(ledPin, LOW);       //if limit has been reached,Both LED and Buzzer turns on as status indicator.}else{digitalWrite(ledPin, HIGH);      //if threshold not reached, LED remains off.}} CIRCUIT:<div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5Xf20BgXStkT6JFIYuWKKC1rE-yr1K9v7Wf-0BbCcsEEoQ3JAbnID5ukQgd4hXkgwFrluv3TAzG854dcdpTTvyU7415mZSAkSDt5EJ8FawyDbvS7PsW5jZ0X2yFDQoiIIxvLKTFZ9-y9A/s1632/MQ-4+Sensor+with+Arduio.png" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="1632" data-original-width="1492" height="640" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEj5Xf20BgXStkT6JFIYuWKKC1rE-yr1K9v7Wf-0BbCcsEEoQ3JAbnID5ukQgd4hXkgwFrluv3TAzG854dcdpTTvyU7415mZSAkSDt5EJ8FawyDbvS7PsW5jZ0X2yFDQoiIIxvLKTFZ9-y9A/w586-h640/MQ-4+Sensor+with+Arduio.png" width="586" /></a></div> <div class="separator" style="clear: both; text-align: center;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNGWNN4gT2qFVhuL0GVcgZwHiCj3qGNn-aMBG6oLojTNRqGQxX8X6TC_ZqgDAL_UYSJQHKiZEQYHOWbEfGuo6YzA09maqlq_JkxC5MlWX4XFSHI3v7WDrv2ubV3b4-LKnQ4rVaY_EXCSVE/s1280/MQ-4+Sensor+with+Arduio+1.jpg" style="margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="720" data-original-width="1280" height="360" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhNGWNN4gT2qFVhuL0GVcgZwHiCj3qGNn-aMBG6oLojTNRqGQxX8X6TC_ZqgDAL_UYSJQHKiZEQYHOWbEfGuo6YzA09maqlq_JkxC5MlWX4XFSHI3v7WDrv2ubV3b4-LKnQ4rVaY_EXCSVE/w640-h360/MQ-4+Sensor+with+Arduio+1.jpg" width="640" /></a></div>

MQ-4 Sensor:

MQ-4 sensor is a gas detecting sensor. This sensor is mainly use to detect Methane, and CNG Gas. This sensor also sensing other flammabl...

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MQ-4 Sensor:

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