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  • October 10, 2018 at 3:20 pm in reply to: A3 CO2 Sensor Mh-Z19B #6132
    David
    Participant

    Hi Wolferl

    Even with 50ppm accuracy your CO2 numbers are below the world numbers https://www.co2.earth/daily-co2
    I would guess that even at a ski hill in Austria your CO2 would be higher than the mountain top in Hawaii.
    If your numbers are correct you have extraordinary good air in your office.

    David

    October 10, 2018 at 1:58 pm in reply to: A3 CO2 Sensor Mh-Z19B #6130
    David
    Participant

    Hi Wolferl

    I notice that your data is stopped every day from 7pm to 1 am .
    It is not clear whether this is internet connection or the power to the Kit1
    This switching is not typical of the A3 unit and could cause different readings especially if the KIT1 lost power periodically.
    I also noticed that your CO2 module reads very low with values much lower than CO2 sensors installed indoors in the recent run of A3.
    There are however random excursions of your CO2 values on Oct 5 and 7th…
    In both our cases it appears that the CO2 sensor behaviour is a mystery.

    David

    October 10, 2018 at 1:40 pm in reply to: A3 CO2 Sensor Mh-Z19B #6129
    David
    Participant

    Hi Wolferl

    I looked at some of the recent A3 indiegogo units and found some CO2 sensors that looked like they were behaving.
    These units looked like they were mounted indoors ( from the temperature swings )
    The units mounted outdoors (again from looking at the temperature swings ) had random excursions of the CO2 like mine.
    There should be some daily movement outdoors, but it is usually periodic, or related to a weather event.
    The movement on my CO2 sensor like others outside appears to be random.
    I was wondering if the CO2 sensor in ABC calibration mode was not suited for outdoor installation as indicated by the spec sheet.

    David

    September 24, 2018 at 5:25 pm in reply to: Introduce Yourself! #6058
    David
    Participant

    Good Afternoon:
    David here, a retired mechanical guy in Canada. I have always been interested in remote monitoring . I am running a shiny new A3 unit outside on the shed #82000137

    ( it however is not playing nice at the moment ).

    Current interests include floating toy balloons around the world at around 12 kilometers above the surface and using H.F. telemetry to monitor, position, altitude,

    wind speed, and other items.

    Here is a link to a balloon that flew over 50000km. http://www.qrp-labs.com/flights/u3b22.html. Other flights have not been so lucky. I hope to add crude radiation

    monitoring data to the balloon transmitter in the future. Ham radio callsign…. VE3KCL.

    D.

    Attachments:

    1. u3b20topantennadetail.jpg

    September 19, 2018 at 6:26 pm in reply to: Wifi connection problems with unit 8200012F #6050
    David
    Participant

    I had the same problem … failing to connect to the home wifi.
    My SSID was 22 letters long … this was the first problem.
    I noticed that after a connect failure it would not display the entire SSID name
    I changed that to an SSID that was 10 letters long
    After a number of tries it still would not connect
    In desperation I added a space after my SSID eg would not connect to “happy wifi” but would connect to “happy wifi ”
    I am not sure if that made a difference and it just requires a number of times to connect but adding a space made it work for me.
    Also do not bother looking for a wifi antenna.. like in the pictures and the instructions.

    Good Luck Dave 82000137

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