Arduino very fast read and very cheap scope!

Project showcase by ArduinoKoen

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  • 3 respects

CO2 Monitor

Project showcase by ArduinoKoen

  • 15,059 views
  • 5 comments
  • 18 respects

Ultra Flat Screen

Project showcase by ArduinoKoen

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  • 1 comment
  • 8 respects

Toolbox 1


Laser Guitar

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30 FPS Video on SSD1106 OLED Display

Project tutorial by saadsaif0333

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Repurpose Old Remote Controls

Project tutorial by VE1DX

  • 18,223 views
  • 5 comments
  • 53 respects

  • 30 FPS Video on SSD1106 OLED Display 7 months ago

    Amazing how you can trick the eye!

  • CO2 Monitor 8 months ago

    Dear Jan,
    I have derived my formulas from datasheets on mq135. The measurement is corrected for water content in the air and temperature.
    Since I used the monitor inside, RH and T did not really vary much. The meter readings however were highly fluctuating. One would expect that during the night the value gradually will come back to the background CO2 concentration. This value however is different every day. It seems that some pollutants adsorb on the element that do not come off easily. 
    Good about MQ 135 is that it senses human presence quite well. As soon as someone enters the room, the readings go up. Especially when all windows and doors are closed. From the time needed to reach a new steady state I have derived that our house needs better ventilation.
    I also found datasheets stating that mq135 is sensitive to many more gasses than only CO2.
    So, MQ135 shows large measuring drift, is not selective and can still give an impression on  ventilation in your house and air quality (good/reasonable/bad). Sensitivity should be set via calibration, not with data from the datasheet as it varies from sensor to sensor  and from time to time.
    For me it was a fun project and I had in mind to do an update of my project with my experiences...
    Good luck.
    Groet, Koen.

    Outlook voor Android downloaden (https://aka.ms/ghei36)

    Van: Hackster.io help@hackster.io
    Verstuurd: maandag 26 oktober 2020 11:29
    Aan: koenmeesters@hotmail.com
    Onderwerp: New comment for CO2 Monitor

  • Virtual Peephole over 1 year ago

    Nice way to confront people!

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