On Wed, 2017-09-20 at 16:46 +0300, Hans Summers wrote:
Hi Peter
If you are powering the QCX from an external supply then the
5V
connection to the programmer in not needed (in my experience).
It will
connect the output of two 5V regulators together which is
probably not a
good idea.
Programmers vary on how they handle this and it is good to check. On
some programmers, it is a V-sense INPUT to the programmer - so that
the programmer can sense what supply voltage the board has, and send
the correct voltage levels accordingly. I use an Olimex programmer and
it is like that. So I think it is one thing that has to be checked
carefully - some programmers need it and some do not!
I should have been more specific. I was only concerned with the
situation shown in Kelly's document which covers using an Arduino UNO as
the programmer.
As you say, other programmers do different things.
PeterO
G0DZB
