MQ-7 Gas Sensor
From James's Wiki
http://wiki.keyestudio.com/index.php/Ks0045_keyestudio_MQ-7_Carbon_Monoxide_Gas_Sensor
/*Arduino Sample Code
* hookup up to analog 0
*/
void setup()
{
Serial.begin(9600); //Set serial baud rate to 9600 bps
}
void loop()
{
int val;
val=analogRead(0);//Read Gas value from analog 0
Serial.println(val,DEC);//Print the value to serial port
delay(100);
}C);//Print the value to serial port
delay(100);
}