[chbot] stm32f103 blue pill power advise?

[Charles Manning]

I agree with Andrew's idea.

You probably don't even need a circuit board, just nobble a cable:

USB to board -------+------|<|---------------USB
                    |
                    +------|<|----- 5V input




On Sun, Dec 23, 2018 at 10:11 PM Andrew Errington <erringtona at gmail.com>
wrote:

> 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
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> >
>> > _______________________________________________
>> > Chchrobotics mailing list Chchrobotics at lists.ourshack.com
>> > https://lists.ourshack.com/mailman/listinfo/chchrobotics
>> > Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
>> > Meetings usually 3rd Monday each month. See http://kiwibots.org for
>> venue, directions and dates.
>> > When replying, please edit your Subject line to reflect new subjects.
>>
>>
>> _______________________________________________
>> Chchrobotics mailing list Chchrobotics at lists.ourshack.com
>> https://lists.ourshack.com/mailman/listinfo/chchrobotics
>> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
>> Meetings usually 3rd Monday each month. See http://kiwibots.org for
>> venue, directions and dates.
>> When replying, please edit your Subject line to reflect new subjects.
>
> _______________________________________________
> Chchrobotics mailing list Chchrobotics at lists.ourshack.com
> https://lists.ourshack.com/mailman/listinfo/chchrobotics
> Mail Archives: http://lists.ourshack.com/pipermail/chchrobotics/
> Meetings usually 3rd Monday each month. See http://kiwibots.org for
> venue, directions and dates.
> When replying, please edit your Subject line to reflect new subjects.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.ourshack.com/pipermail/chchrobotics/attachments/20181224/e5c7b01a/attachment.html>