Determine power source on expansion board
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I have a Pytrack and I'd like to know whether or not it is plugged in and receiving power from USB or if it is running off the battery (and charging)
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@shaunix It would be charging if receiving power from USB, not running off the battery, obviously.
The simplest method is probably to use the on-board voltage divider and an appropriately configured ADC to measure the battery voltage. The charging voltage is higher than any voltage you may get while running off the battery.
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