Repository for the Hackaday project Gas Sensor Grenade with Arduino
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https://hackaday.io/project/4742-gas-sensor-for-emergency-workers
In my professional life I have used many different gas analyzers for confined space entry as well as emergency response. These units are very expensive and require the user to be able to read the display or be close enough to hear the alert generated if an unsafe condition exists where human entry would need other measures.
I made this to be a very cheap and easily reproduced product which could simply be thrown into any uncertain environment such as a confined space, building with a possible gas leak, fire etc. Any potential entry person can just toss the ball into the area and remotely receive the gas and smoke levels via voice from several hundred meters away.
I used an MQ2 smoke, LPG (Liquified Petroleum Gas), and CO (Carbon Monoxide) sensor. I used freely available code to get the sensor working with an Arduino Nano. Then taking an Ultra Cheap 433MHZ transmitter to output real voice transmit to any basic radio within the area
Update Oct 14 2015
As noted on the project logs I found the MQ2 sensor needs to be upgraded to read more gasses but more importantly it needs to be updated because when triggered it will cause false positives on the remaining two levels when only one is triggered. I have tried everything I can think of to get around this with little luck
As a result I have made the code simple whereby it only announces either SAFE or ALERT (3 times) for the human voice annunciation. This is safer because one will treat the area as possibly contaminated with all 3. Untill I can afford a better sensor suite- enjoy!
Eric
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License. https://creativecommons.org/licenses/by-nc/4.0/