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djr7710 wrote:Hi Caffeine, that's interesting, please keep us informed of your progress. It seems strange that the SD card would take so much power; I was assuming that the main power draw was the GPS.hot or warm start, should take 2 to 15 seconds, depending on how long it's been powered off.
Perhaps the easiest solution would be a small daughterboard with a little PIC which would only enable power to the GPS datalogger every X minutes. The datalogger code could be changed to only get one sample, then the PIC would shut off the power again. As I understand it all the satellite information would be retained via the battery power, so it shouldn't take the GPS long to reacquire its position each time it is turned on.[/img]
Caffeine wrote: hot or warm start, should take 2 to 15 seconds, depending on how long it's been powered off.
Reading up on the SD card spec, it seems they take 50 to 100mA when running! Only 8 to 15mA in standby mode though.
It should probably be put in standby mode bwteen writes, as a second is an awefully long period, that would reduce the average consumption.
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