Navigation

    • Register
    • Login
    • OpenHardware.io
    • Categories
    • Recent
    • Tags
    • Popular
    1. Home
    2. wreiner
    • Profile
    • Following
    • Followers
    • Topics
    • Posts
    • Best
    • Groups

    wreiner

    @wreiner

    0
    Reputation
    1
    Posts
    376
    Profile views
    0
    Followers
    0
    Following
    Joined Last Online

    wreiner Follow

    Best posts made by wreiner

    This user hasn't posted anything yet.

    Latest posts made by wreiner

    • RE: Air Quality Sensor

      Hey all,

      I've got a question regarding the calibration function in https://github.com/empierre/arduino/blob/master/AirQuality-Multiple_Gas_Sensor1_4.ino :

      $ grep MQCalibr *
      AirQuality-Multiple_Gas_Sensor1_4.ino:  Ro0 = MQCalibration(MQ2_SENSOR,10,RL0,SmokeCurve);
      AirQuality-Multiple_Gas_Sensor1_4.ino:  Ro1 = MQCalibration(MQ6_SENSOR,10,RL1,LPGCurve);
      AirQuality-Multiple_Gas_Sensor1_4.ino:  Ro2 = MQCalibration(MQ131_SENSOR,10,RL2,O3Curve);
      AirQuality-Multiple_Gas_Sensor1_4.ino:  Ro3 = MQCalibration(TGS2600_SENSOR,10,RL3,C2H5OH_terCurve);
      AirQuality-Multiple_Gas_Sensor1_4.ino:  Ro4 = MQCalibration(MQ135_SENSOR,10,RL4,CO_secCurve);
      AirQuality-Multiple_Gas_Sensor1_4.ino:  Ro6 = MQCalibration(TGS2602_SENSOR,1,RL6,C7H8Curve);
      ....
      AirQuality-Multiple_Gas_Sensor1_4.ino:float MQCalibration(int mq_pin, double ppm, double rl_value,float *pcurve )
      

      Th function MQCalibration should calibrate the sensor in clean air, the calibration function uses the PPM concentration of the gas in a clean air environment.
      You already use the appropriate value for i.e. CO2 (around 399 PPM) in the MQ135 sketch - but why are you using those obscure values in the calibration (1, 10) here?

      Thanks in advance!

      posted in Hardware
      wreiner
      wreiner