MQ-135 Air Quality Sensor

৳ 180.00

MQ-135 Air Quality Sensor

MQ-135 is an air quality or air pollution measuring sensor device. It can detect various chemical contents in air and give appropriate voltage variation at the output pin depending on the chemical concentration in air.

It can detect alcohol, Benzene, smoke, NH3, butane, propane etc. if anyone of the stated chemical concentration rises, the sensor convert the chemical concentration in air to appropriate voltage range, which can be processed by Arduino or any microcontroller. It cannot tell what kind of chemical concentration rose in the air.

The gas-sensing material used in the MQ135 gas sensor is tin dioxide (SnO2), which has a low electrical conductivity in clean air.

  • the analog output 0 ~ 5V voltage,
  • the air quality, harmful gas detection has better sensitivity.
  • there are four screw holes to facilitate positioning;
  • the working voltage: 5V

Package Included:

1 X MQ-135 Air Quality Sensor


Arduino And MQ 135 Gas Sensor With Arduino Code

Sample Code:

#include <LiquidCrystal.h>
int sensorValue;
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
void setup(){  lcd.begin(16, 2);
Serial.begin(9600);                            // sets the serial port to 9600
void loop(){sensorValue = analogRead(0);       // read analog input pin 0
Serial.print(sensorValue, DEC);               // prints the value read
Serial.println(" PPM");
lcd.print(" PPM");
lcd.println("       "); 
lcd.print("  ");
delay(100);                                   // wait 100ms for next reading


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