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<p><font face="Candara">or just in series with the USB to stop
feeding the computer.</font></p>
<p><font face="Candara">Mark</font><br>
</p>
<br>
<div class="moz-cite-prefix">On 24/12/18 07:14, Charles Manning
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAE21AQoXjuUqq8FNAKXRUf8PeKHFNkrySPE1pcsZ4ipdiop7_A@mail.gmail.com">
<div dir="ltr">
<div>I agree with Andrew's idea.</div>
<div><br>
</div>
<div>You probably don't even need a circuit board, just nobble a
cable:</div>
<div><br>
</div>
<div><span style="font-family:monospace,monospace">USB to board
-------+------|<|---------------USB</span></div>
<div><span style="font-family:monospace,monospace">
|</span></div>
<div><span style="font-family:monospace,monospace">
+------|<|----- 5V input</span></div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr">On Sun, Dec 23, 2018 at 10:11 PM Andrew Errington
<<a href="mailto:erringtona@gmail.com"
moz-do-not-send="true">erringtona@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="auto">
<div>Hi Peter,
<div dir="auto"><br>
</div>
<div dir="auto">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.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Best wishes,</div>
<div dir="auto"><br>
</div>
<div dir="auto">Andrew</div>
<br>
<br>
<div class="gmail_quote">
<div dir="ltr">On Sun, Dec 23, 2018, 21:32 Henri Shustak
<<a href="mailto:henri.shustak@gmail.com"
target="_blank" moz-do-not-send="true">henri.shustak@gmail.com</a>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px
0px 0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">Hello again,<br>
<br>
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.<br>
<br>
Henri<br>
<br>
> On 23/12/2018, at 1:58 AM, Peter Ellens <<a
href="mailto:ellensp@gmail.com" rel="noreferrer"
target="_blank" moz-do-not-send="true">ellensp@gmail.com</a>>
wrote:<br>
> <br>
> Is this on topic? I don't know.... not sure
what on topic encompasses any more!<br>
> <br>
> (maybe Mark could clarify on that)<br>
> <br>
> Details on the stm32f103 blue pill for those that
don't know it. <a
href="https://wiki.stm32duino.com/index.php?title=Blue_Pill"
rel="noreferrer noreferrer" target="_blank"
moz-do-not-send="true">https://wiki.stm32duino.com/index.php?title=Blue_Pill</a><br>
> <br>
> 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.<br>
> <br>
> 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.<br>
> <br>
> 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.<br>
> <br>
> Any thoughts or ideas?<br>
> <br>
> Thanks<br>
> <br>
> Peter E<br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> <br>
> _______________________________________________<br>
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