Back to work! New Gas Sensor Needed

A project log for Gas Sensor For Emergency Workers

Gas sensor "grenade" that may save lives instead of taking them. The sensor can be thrown into dangerous areas to remotely report levels

Eric WiiliamEric Wiiliam 09/04/2015 at 21:260 Comments

Just got back from 2 weeks of work in Europe so the project is behind a bit more than I would like. Did some more testing today and I have confirmed that the MQ-2 sensor indeed is not perfect for taking this project to the "next level" in commercial applications. It performs great but I can attest that with my code it has an annoying weakness with discriminating between the 3 levels if saturation is high.

With that said, it does perform great as long as you don't need discreet levels. It seems to trigger just fine- only the measurements can be unreliable as it canl announce a gas or level that isn't fully accurate (basically 2 levels will announce but only one is truly in the test environment). I am still trying to source a commercial grade sensor that I can afford to integrate- but for now I think I may just mod the code so it is strictly a go/no go indication of a dangerous condition. For this it seems to work great! No issues at all with even a slight amount of smoke or gas.

I will also try modding the code to attempt better resolution between the gasses. I have my doubts this can be done reliably. A proper commercial grade sensor seems to be the path forward but I am willing to try :)

This is simply the best part of inventing for me- working out minor hurdles and ending up better than the original target.

Next up a video of assembling the unit with my custom PCB's linked on this project. First test seems to work great!

Full assembly video tutorial coming soon! Cheers