[chbot] stm32f103 blue pill power advise?

[Andrew Errington]

Hi Peter,

It looks like everything on the board runs at 3.3V from an on-board
regulator therefore your 5V supply only needs to be nominal. How about
running your power inputs into a pair of Schottky diodes? The voltage drop
is small, and you could build a tiny circuit board with a micro USB socket
and whatever you need for your other 5V supply as input, and a micro USB
plug as output.

Best wishes,

Andrew


On Sun, Dec 23, 2018, 21:32 Henri Shustak <henri.shustak at gmail.com wrote:

> Hello again,
>
> Also, as this likely pulls very little power. I will also mention the
> Voltaic Systems V15 feature an always on power mode. As such, it is not
> going to just turn off when a few milliamps are being pulled.
>
> Henri
>
> > On 23/12/2018, at 1:58 AM, Peter Ellens <ellensp at gmail.com> wrote:
> >
> > Is this on topic?  I don't know....  not sure what on topic encompasses
> any more!
> >
> > (maybe Mark could clarify on that)
> >
> > Details on the stm32f103 blue pill for those that don't know it.
> https://wiki.stm32duino.com/index.php?title=Blue_Pill
> >
> > I'm playing with a project that has a stm32f103 blue pill at its core.
> Many of you will know this board and I'm hoping that some of you will have
> more practical experience with this board than I.
> >
> > What I am wanting is to be able to power the board from either USB or a
> external 5v source, preferably being able to remove one or the other supply
> and it keeps going, without modifications to the blue pill board or the USB
> cable.
> >
> > The issue is the 5v line from the USB is directly connected to the 5v
> pin of the module, so you can have one or the other supply, but not both.
> This problem is well known, but I have not seen a solution.
> >
> > Any thoughts or ideas?
> >
> > Thanks
> >
> > Peter E
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
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