[chbot] stm32f103 blue pill power advise?

[Mark Atherton]

I like this.

Might go with a short USB A to Micro USB cable then make the diode power 
junction inside a USB A type M-F extender cable.

CPU consumes about 50mA at 3.3V, so 500mA diodes, and can be made for 
next to nothing.

So almost zero cost, very little heat, no modifications to the CPU board.

Well done Volker.

-Mark

On 24/12/2018 12:28 PM, Volker Kuhlmann wrote:
> On Mon 24 Dec 2018 11:14:29 NZDT +1300, Mark Atherton wrote:
>
>> All good, but the original posting asked for no modifications be done
>> to the PCB.
>>
>> Can't see how this might be done if you mess with USB anything...
> Make an inline USB adapter, microUSB male/female, containing a schottky
> diode. Feed 5V externally as it is. Hang everyone connecting USB
> directly...
>
> Are there short micro USB extension cables? Slice into that, cut the 5V
> cable and insert a schottky. Rigid adapters plugged into devices are a
> dicey mechanical proposition.
>
> As Andrew astutely observed, all goes on 3.3V so schottky drops
> shouldn't be relevant.
>
> Volker
>