Ethernet/Serial Gateway on 3.3V?

[andriej]

Hi!

Fast question for my current project - are there any arguments against using ProMini 3.3v as a serial/ethernet gateway?
The only difference from 5v is the clock - 8MHz, but I guess it's still powerfull enough to run the job.

I mean - i know it will be working… Just want to know if it will be 100% the same reliable.

Regards

[Stric]

I use a 3.3V promini as serial gw (with an 'socat' hack to ethernet enable it on an rpi.. one day I'll add the w5100..), and it works fine. I think I've had it hang for unknown reasons 2 times in a bunch of months.

[andriej]

Okay, it's worth saying how it's going.

The only problem tjhat I've (somehow) solved was 'disappearing' of the gateway under unknown circumstances.
Solution? Transistor controlled by GPIO of the board (which was powering the arduino pro too).

For full redundancy I'm powering Pro Mini with RAW port with 3.3V, so it's double stabilized.
I've never had problems with nRF chips, but I've also put the 4.7uF between VCC and GND on radio.

So, answering the question - it will work.

Regards