If you are looking to detect explosive gases eg propane you could use sensors such as the MQ6. Got this sensor working nicely with Arduino Uno. More in my blog at Internet of Things: Propane Gas Sensor Using the Arduino Uno
If you are looking to detect explosive gases eg propane you could use sensors such as the MQ6. Got this sensor working nicely with Arduino Uno. More in my blog at Internet of Things: Propane Gas Sensor Using the Arduino Uno