CO2 Sensor MQ-135 GAS SENSOR

Discussion in 'General Electronics Chat' started by RodneyB, Sep 26, 2016.

  1. RodneyB

    Thread Starter Active Member

    Apr 28, 2012
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    I would like to make a CO2 sensor to go into the back of a truck carrying chickens.

    I would like to know if the CO2 level is rising and I would also like to know before it gets dangerously high.

    I can buy locally the MQ-135 GAS SENSOR and want to know if this is suitable and if I would have to add any other circuit.

    The supply voltage would be 12 Volts. From a 7Ah Sealed Lead Acid battery
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    That sensor is not designed specifically to measure CO2. In the case of livestock, it will be severely overwhelmed with NH3. The CO2 concentration in air is about 0.04% or 400ppm.

    The other consideration with gas sensors and detection instruments is you have to calibrate them. This requires applying a gas sample of known concentration in the range of your interest.
     
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  3. jpanhalt

    AAC Fanatic!

    Jan 18, 2008
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    What is considered the safe level for chickens? Is there also a limit on ammonia?

    If there is not a specific detector, a little pre-chemistry or selective adsorption/entrainment can distinguish between CO2 and NH3.

    John
     
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  4. MrChips

    Moderator

    Oct 2, 2009
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    RodneyB and ericgibbs like this.
  5. RodneyB

    Thread Starter Active Member

    Apr 28, 2012
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    Thank you for all the advice and Help. After reading everything here I believe its probably best that I buy a unit that is already made and can be used in my application. Now to find the unit.
     
  6. Sensacell

    Well-Known Member

    Jun 19, 2012
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