[chbot] stm32f103 blue pill power advise?

[Henri Shustak]

I like the little USB current / voltage meters so much. I made up leads so that you can have 2.5mm -> USB and then back again to 2.5mm / 2.1mm DC plug. Just easier than using a multi-meter for some applications.

Obviously, it depends on what you are doing, but USB cables are used on so many things these days.

Henri.

> On 24/12/2018, at 1:32 PM, Mark Atherton <markaren1 at xtra.co.nz> wrote:
> 
> 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
>> 
> 
> 
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