New answers tagged voltage-level
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I would recommend using a display that does not require 5v to run. Using a lower voltage display like an led based one will simplify the system. My favorite thing to use is the adafruit feather huzzah8266 with the charlieplex display board on top. They fit together via header pins and it has a built in lipo charging circuit and battery connector. You can ...
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This is exactly why the typical LiPO battery shield includes a boost converter.
I'm not sure where you saw the unusually high (3.5V) low-voltage limit, but that isn't typical of most converters.
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