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MQ-135 gas sensor

MQ-135 gas sensor is a hazardous gas detection apparatus for the family, the environment, suitable for ammonia, aromatic compounds, sulfur, benzene vapor, smoke and other gases harmful gas detection, gas-sensitive element test concentration.

Air quality sensor is for detecting a wide range of gases, including NH3, NOx, alcohol, benzene, smoke and CO2. Ideal for use in office or factory, simple drive and monitoring circuit.

The sensitivity of the sensor can be adjusted by using the potentiometer.

MQ-135

MQ-135

FEATURES
* High sensitivity to Sulfide, benzene Department of steam, smoke and other harmful gases
* Long life and low cost
* Simple drive circuit

Connection

here are the connections for my sensor

Arduino Gas Sensor
5V VCC
GND GND
NC DO
Analog A0 AO

Code

void setup() 
{
  Serial.begin(9600);
}
 
void loop() 
{
  float sensorVoltage; 
  float sensorValue;
 
  sensorValue = analogRead(A0);
  sensorVoltage = sensorValue/1024*5.0;
 
  Serial.print("sensor voltage = ");
  Serial.print(sensorVoltage);
  Serial.println(" V");
  delay(1000);
}

Results

Again look at the serial monitor, you need to let the sensor stabilise. Remember it consists of a heating element, so you effectively have to let the sensor ‘heat up’.

sensor voltage = 0.30 V
sensor voltage = 0.31 V
sensor voltage = 0.33 V
sensor voltage = 0.34 V
sensor voltage = 0.35 V
sensor voltage = 0.32 V
sensor voltage = 0.31 V
sensor voltage = 0.30 V

Links

Mq-135 datasheet

 
MQ-135 Air Quality Sensor Hazardous Gas Detection Module for Arduino

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MQ-9 gas sensor

MQ-9 gas sensor has high sensitity to Carbon Monoxide, Methane and LPG. The sensor could be used to detect different gases contains CO and combustible gases, it is with low cost and suitable for different application.

The sensitivity of the sensor can be adjusted by using the potentiometer.

MQ-9

MQ-9

FEATURES

* Good sensitivity to CO/Combustible gas
* High sensitivity to Methane, Propane and CO
* Long life and low cost
* Simple drive circuit

Connection

here are the connections for my sensor

Arduino Gas Sensor
5V VCC
GND GND
NC DOUT
Analog A0 AOUT

Code

void setup() 
{
  Serial.begin(9600);
}
 
void loop() 
{
  float sensorVoltage; 
  float sensorValue;
 
  sensorValue = analogRead(A0);
  sensorVoltage = sensorValue/1024*5.0;
 
  Serial.print("sensor voltage = ");
  Serial.print(sensorVoltage);
  Serial.println(" V");
  delay(1000);
}

Results

Again look at the serial monitor, you need to let the sensor stabilise. Remember it consists of a heating element, so you effectively have to let the sensor ‘heat up’.

sensor voltage = 0.40 V
sensor voltage = 0.40 V
sensor voltage = 0.40 V
sensor voltage = 0.42 V
sensor voltage = 0.41 V
sensor voltage = 0.41 V
sensor voltage = 0.41 V
sensor voltage = 0.41 V
sensor voltage = 0.40 V

Links

Mq-9 datasheet
MQ-9 Combustible Gas Detector Carbon Monoxide CO Sensor Module for Arduino

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MQ8 Gas Sensor

The MQ8 Gas Sensor module is useful for gas leakage detection. They are used in gas leakage detecting equipments in home and industry, are suitable for detecting of Hydrogen.  Due to its high sensitivity and response time, measurements can be taken as soon as possible.

Try and avoid alcohol, LPG,cooking fumes as the sensor has slight sensitivity to these substances and this may affect results

The sensitivity of the sensor can be adjusted by using the potentiometer.

MQ-8

MQ-8

FEATURES

* High sensitivity to Hydrogen
* Small sensitivity to alcohol, LPG,cooking fumes
* Fast response .
* Stable and long life
* Simple drive circuit

Connection

here are the connections for my sensor

Arduino Gas Sensor
5V VCC
GND GND
NC DO
Analog A0 AO

Code

void setup() 
{
  Serial.begin(9600);
}
 
void loop() 
{
  float sensorVoltage; 
  float sensorValue;
 
  sensorValue = analogRead(A0);
  sensorVoltage = sensorValue/1024*5.0;
 
  Serial.print("sensor voltage = ");
  Serial.print(sensorVoltage);
  Serial.println(" V");
  delay(1000);
}

Results

Again look at the serial monitor, you need to let the sensor stabilise. Remember it consists of a heating element, so you effectively have to let the sensor ‘heat up’.

sensor voltage = 0.58 V
sensor voltage = 0.58 V
sensor voltage = 0.58 V
sensor voltage = 0.57 V
sensor voltage = 0.60 V
sensor voltage = 0.67 V
sensor voltage = 0.67 V
sensor voltage = 0.70 V
sensor voltage = 0.70 V
sensor voltage = 0.66 V
sensor voltage = 0.64 V

 

Links

MQ8 datasheet
MQ8 Hydrogen Gas Sensor H2 Detection Sensor Module Gas Sensor for Arduino

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MQ7 Gas Sensor

The MQ7 Gas Sensor module is useful for gas leakage detection. They are used in gas leakage detecting equipments in home and industry, are suitable for detecting of Carbon Monoxide.  Due to its high sensitivity and response time, measurements can be taken as soon as possible.

The sensitivity of the sensor can be adjusted by using the potentiometer.

mq-7

mq-7

FEATURES

* High sensitivity to Carbon monoxide
* Fast response .
* Stable and long life
* Simple drive circuit

 

Connection

here are the connections for my sensor

Arduino Gas Sensor
5V VCC
GND GND
NC DO
Analog A0 AO

Code

void setup() 
{
  Serial.begin(9600);
}
 
void loop() 
{
  float sensorVoltage; 
  float sensorValue;
 
  sensorValue = analogRead(A0);
  sensorVoltage = sensorValue/1024*5.0;
 
  Serial.print("sensor voltage = ");
  Serial.print(sensorVoltage);
  Serial.println(" V");
  delay(1000);
}

 

Results

Again look at the serial monitor, you need to let the sensor stabilise. Remember it consists of a heating element, so you effectively have to let the sensor ‘heat up’.

sensor voltage = 1.54 V
sensor voltage = 1.51 V
sensor voltage = 1.50 V
sensor voltage = 1.47 V
sensor voltage = 1.46 V
sensor voltage = 1.44 V
sensor voltage = 1.43 V
sensor voltage = 1.41 V
sensor voltage = 1.39 V
sensor voltage = 1.38 V
about 4 minutes of readings here – 1 per second
sensor voltage = 0.71 V
sensor voltage = 0.71 V
sensor voltage = 0.71 V
sensor voltage = 0.71 V
sensor voltage = 0.71 V
sensor voltage = 0.71 V
sensor voltage = 0.70 V
sensor voltage = 0.70 V
sensor voltage = 0.71 V
sensor voltage = 0.70 V

 

Links

Mq-7 Gas sensor spec
MQ-7 Carbon Monoxide CO Gas Sensor Module Kit for Arduino

 

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