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U3s firware update

 

When using Avrdudess to update the firmware on my U3S, going through my arduino uno, does the arduino power the U3S or does it need to also be powered? Hope this ain't to stupid of a question. LOL. Thanks Carl
 

The short answer is the U3S needs to be powered. It is not powered from the Arduino. There's a doc at QRP Labs site covering updating a QCX, but the procedure works the same for U3S.


Here's a snip from the PDF:

I have flashed both my U3S and QCX using this procedure. The only glitch in the doc is in Step 4e "Select ATmega328 as the MCU" It should be ATmega328P. I believe Hans has stated this is the chip they usually ship.

--Al
WD4AH
 

Hi Al, Carl
?
I have flashed both my U3S and QCX using this procedure. The only glitch in the doc is in Step 4e "Select ATmega328 as the MCU" It should be ATmega328P. I believe Hans has stated this is the chip they usually ship.

Sometimes we use ATmega328, sometimes ATmega328P. It depends only on availability and price, at the time I am purchasing the chips. They are equivalent for the purposes of QRP Labs kits. So if you get a message about the device signature being wrong, just change the chip name selection (or the name in the command if using a avrdude at the command line), try the other one.

73 Hans G0UPL
 

The basic difference between the two is that the 328P implements the
PicoPower standby modes, allowing longer battery life in situations
where the processor is inactive most of the time. None of the QRP Labs
kits use or need those modes, as the processor is always active when
the radio is turned on.

On Wed, Jul 11, 2018 at 2:53 AM, Hans Summers <hans.summers@...> wrote:
Hi Al, Carl


I have flashed both my U3S and QCX using this procedure. The only glitch
in the doc is in Step 4e "Select ATmega328 as the MCU" It should be
ATmega328P. I believe Hans has stated this is the chip they usually ship.

Sometimes we use ATmega328, sometimes ATmega328P. It depends only on
availability and price, at the time I am purchasing the chips. They are
equivalent for the purposes of QRP Labs kits. So if you get a message about
the device signature being wrong, just change the chip name selection (or
the name in the command if using a avrdude at the command line), try the
other one.

73 Hans G0UPL
 

Thanks for the info guys and gal. I did not know the difference between 328 and 328P but did know there is a P version. Carl? AB1ZI

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