MQ 135 sensor
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Thread: MQ 135 sensor

  1. #1
    Join Date
    Jun 2009
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    Default MQ 135 sensor

    i have a MQ135 air quality sensor connected to a 18F2450 and I am able to get analog readings from it. I am interested in the CO2 readings, but looking at the datasheet it appears that to go from an analog reading to a parts-per-million equivalent involves some logarithmic math. Does anyone have any suggestions for getting around this? I would settle for something that provided an approximation.

  2. #2
    Join Date
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    Default Re: MQ 135 sensor

    Quote Originally Posted by kduck63 View Post
    i have a MQ135 air quality sensor connected to a 18F2450 and I am able to get analog readings from it. I am interested in the CO2 readings, but looking at the datasheet it appears that to go from an analog reading to a parts-per-million equivalent involves some logarithmic math. Does anyone have any suggestions for getting around this? I would settle for something that provided an approximation.
    I would check Github page for it; look for Arduino code examples to see how they translate "an analog reading to a parts-per-million equivalent".
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte

  3. #3
    Join Date
    Sep 2009
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    Default Re: MQ 135 sensor

    As far as I know, best way in PBP is to use lookup table and linear interpolation.

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