MQ-135 Air quality and hazardous gas detection sensor alarm module.

1. Size: 32mm X22mm X30mm length * width * height

2. The main chip: LM393, MQ135 gas sensing probe

3. Operating voltage: DC 5V

Features:

1. Signal output indicator instructions;

2. Dual signal output

3. TTL output valid signal is low; (Output low signal light, which can be accessed microcontroller IO port)

4. Analog output with increasing concentration, the higher the concentration, the higher the voltage;

5. Sulfide, benzene Department of steam, smoke and other harmful gasses with high sensitivity;

6. Has a long life and reliable stability;

7. Rapid response recovery characteristics;

Applications:

A hazardous gas detection apparatus for the family, the environment, suitable for ammonia, aromatic compounds, sulfur, benzene vapor, smoke and other gasses harmful gas detection, gas-sensitive element test concentration range: 10 to 1000ppm

Example code:

int SensorValue;

void  setup ()
{
  Serial . begin (9600);      // sets the serial port to 9600
}

void  loop ()
{
  SensorValue = analogRead (0);       // Read analog input pin 0 
  Serial.println (SensorValue, DEC );  // Prints the value read
   delay (100);                        // Wait 100ms for next reading 
}