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The gas sensor detects Hydrogen gases. It is able to give alarms when the smoke/gas leaks. You can adjust the sensitivity with the potentiometer.

This sensor will return an analog value which represents the intensity of the gas being detected.

This sensor will also return a digital value(0 or 1) from TTL pin. The output will be "0" when gas's potency is above certain value.

• Dector：QM-N10
• Voltage for working( VH )：5±0.2V ( AC or DC )
• Current: 150mA
• Sensitivity：≥5
• Size: 32x20x22mm
• Temperature: -15 ~ 40℃ ( 5 ~ 104℉ )
• Humidity: 20～85%RH

Tip: When the element connects to the source, it needs about 1 min to get pre-heated before use.

AO -Analog output

DO -Digital output (TTL : 0 | 1)

GND

VCC

With analog output as a sample:

void setup() 
{ 
  Serial.begin(9600); // 9600 bps
}
void loop() 
{
  int val;
  val=analogRead(0);
  Serial.println(val ,DEC);// serial print val
  delay(100);
}