[chbot] stm32f103 blue pill power advise?

[Henri Shustak]

Also, as suggested the V15 means that it is all handled up stream. You just have it like a UPS and then attach what ever power supply (although probably not both at once without the diodes) to the V15. The added advantage is that it is solar powered if you add on a solar panel as the V15 supports 6V solar input for charging. 

As Mark mentioned. None of these options are touching the PCB. But I feel like as long as the diode is sufficiently sized then having it inline on the input cable means it will not get hot. You could always mount to a heat sink if you were really concerned. The nice think about not modifying the PCB is that if it fails you just swap it out rather than having a special board being used.

Henri



> On 24/12/2018, at 11:14 AM, Mark Atherton <markaren1 at xtra.co.nz> 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...
> 
> -Mark
> 
>> On 24 December 2018 at 10:36 Mark Beckett <m.beckett at amuri.net> wrote: 
>> 
>> or just in series with the USB to stop feeding the computer.
>> 
>> Mark
>> 
>> 
>> On 24/12/18 07:14, Charles Manning wrote: 
>>> 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 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
>>> > 
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