MQ2 Smoke sensor gas concentration calculation

Using Arduino Sensors
1

i just bought a new DFRobot MQ2 Smoke Sensor. ive read online about how to calibrate smoke sensors. and ive derived an equation for the CO line
X = 10^(log(y)−1.512/−0.339)

where x is PM and y is RS/R0.

and i put this on my arduino, get my readings. suppose case 1 i put a cigarrete close to the sensor i would get a rs/r0 of 1.5. now when i put this on the equation, i would get a ppm value of 8724. which is ridiculously high compared to online sources saying a ppm value of 150-200 is dangerous. is it even right to compare these?

2

If you have not "burned in" the sensor for 48 hours or more (as mentioned in the data sheet), the measurements are meaningless.

Even after burn-in, the sensor must be calibrated against a known standard.

You may find this Electronic Nose project interesting and helpful:
https://web.archive.org/web/20180513090020/http://www.maskau.dk/projects/electronic-nose

3

i see, i will have a look at that, thank you.

4

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