Question concerning low voltage arduino Pro mini

[dakky]

ah now i understand ... and feel a little bit stupid :P

maybe trying to think too much about simple things .. thanks for your patience

[Anticimex]

@dakky No worries. Better to think too much than too little :)

[FotoFieber]

The 328P is working with
8 MHz in the range of +2.7 - +5.5 V

I do program all my arduinos with 5V.

Detach the NRF24L01+ and other 3.3V sensors or they may die while you attach 5V.

Use at your own risk. :)

[Anticimex]

@FotoFieber @dakky yeah, but the cheap Chinese clones on eBay does not because people have reported them dying so make sure you use "genuine" HW in that case. I have not experienced it myself because my ftdi board is 3.3V only and it's only my gw (Arduino nano) that run on 5V and that one has "native" USB so no ftdi board is needed.

[tbowmo]

I think one of the problems, of dying 3V3 arduinos, is people that doesn't disconnect the 3V3 regulator on board. If you then supply the board with 5V on VCC pins, you might destroy the regulator, which then could short circuit.

But if the regulator is removed from the circuit, as in this example, I don't see any thing wrong in supplying the arduino with 5V on the VCC pins, but you should take care of any connected peripherals, that aren't 5V compatible.

[Anticimex]

I see. Perhaps the site should be updated to clarify this. It has a section for FTDI voltage selection. Ping @hek

[hek]

@Anticimex

So what should I update?

When doing FTDI upload for 3v3 Pro Minis, shouldn't the FTDI be set to 3v3?
I would rather not make this page to complex as it is part of the "getting started" guide.

[Anticimex]

@hek Perhaps it is fine as it is. I just thought that since this thread was created in the first plase, there is room for confusion. Especially since the picture linked in the authors first post is from the site.

[dakky]

In this case a simple note on the battery site, that we have to be careful to supply a stable 3v3 source after removing the regulator would help.
For you, as u are much more experienced, this is a nobrainer, but for beginners like me, this remark would help.

[hek]

Ok, added a note over there. Will pop up next time I deploy.