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I would like to connect Adafruit's powerboost 1000C LBO control pin to a rPi GPIO-pin. So I can gracefully shutdown my rPi when the LiPo runs low.

I would like to connect the LBO to a diode to lower the voltage from 4.2 max down to 3.6 Volts and connect the 3.6 Volts directly to a GPIO pin.

Q Is this a reasonable and safe way to connect the LBO to a GPIO-pin? Are there any hazards I need to take into account?

An even simpler solution would also be highly appreciated.

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    The Pi GPIO should not be exposed to voltages greater than 3V3. – joan May 3 at 11:17
  • I think this answer provides a nifty solution for my problem. – participant May 9 at 11:12

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