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Hi,

I assume that the z-uno can be supplied from a charging LiPo battery (can vary from 3,5-4 V) via the 3,3 V in port, that is regulated by a MCP1700, is that correct?

Br
Staffan

It isn't. Z-Uno tolerated up to 3.6. even 3.7 is too big

So the only way to connect power via the onboard MCP1700 regulator is to the USB port? If that is the case, can I use lower voltage then 5 V to the USB? I cant go via the NCP1117, it has to high dropout.

Or maybe would my best option be to put a TO-92 LDO in the 3.3 VIN holes, like a LE33CZ for example?

Lipo has a really high amount of current flow characteristics.So be careful while you are using it. A small size lipo can make a large amount of explosion.

You can use the 5V input for it - but do not use USB AND LiPo parallel.
Use the Lipo for powering the Z-Uno and a serial connection without USB poer for programming, if you need parallel work.

Or use while programming via USB a diode in serial to the LiPo cell - but not for production (because of drop voltage at diode)

I using it since a long time together with solar charging module.
Good idea is to control the voltage via Z-Uno.

Michael