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Reply To: Low Cost EC sensor Station upgrade

Home Forums Mayfly Data Logger Low Cost EC sensor Station upgrade Reply To: Low Cost EC sensor Station upgrade

Jim Moore

    Thanks.  I am using the FTDI port and wiggled some plugs, etc and now is loading ok.  I assume when I was getting that error the mayfly was plugged in and turned on because when I attempt to load with the pwr switch turned off I get the following error:

    Uploading .pio\build\mayfly\firmware.hex
    avrdude: ser_open(): can’t open device “\\.\COM4”: Access is denied.
    avrdude done.  Thank you.
    *** [upload] Error 1
    I guess a bad connection somewhere.