Supercap state when RPi is shutdown

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  • #14449

    Hello folks!

    I understand that the supercap holds charge for storing ephemeris data fro 4 hours. If the RPi is shutdown, however still powered, the power pins on the RPi are still able to provide charge to the cap. Does this mean that the ephemeris data could be stored for a longer duration?

    Thanks in advance.



    Mark Williams

    Yes.  in fact , as the 3.3v pin still has power.  The GPS will be fully on and will not need to use the supercap.

    If you do turn it off completely.. the longer you wait to turn it back on, the longer the fix will take as the ephemeris (true orbit)  being held in the SuperCap  will be older.

    BTW: if you need to get a fix in seconds… no matter how long the device was off, this can be done using the BerryGPS-GSM, which supports assisted GPS.

    Mark --

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