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Arduino Forum MQ135 MQ2 sensors - meaning of the values

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MQ135 MQ2 sensors - meaning of the values

matfur92 over 10 years ago

Hi,

how can I interpret the values between 0 and 1023 that I get from reading these sensors with Arduino?

I have not found bands of values or indicators a bit 'more specific about which indicates a certain range of values.

If anyone has any ideas to help me thank you very much!

PS: I mean something more specific than just a percentage value

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neilk over 10 years ago

Google MQ135 sensor and MQ2 sensor and get a wealth of information, including data sheets which show graphs relating sensor output voltage to ppm gas content.

There are even some where Arduino has been used.

Have a good look.

Neil
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Former Member over 9 years ago in reply to neilk

What is the heatup time or preheat time for MQ135 sensor?? Didn't you need to heat it up for 24 hours??
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Former Member over 9 years ago in reply to neilk

What is the heatup time or preheat time for MQ135 sensor?? Didn't you need to heat it up for 24 hours??
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