Random Hangs of emonPi/emonSD

[Greebo]

@ebsol

I noticed that the ATMega328 microprocessor was running from a 3.3V supply, but has a 16MHz crystal. I’m sure I read somewhere that 16MHz was only supported when running on a 5V supply, If that’s true then I wondered if this was the cause of the spurious behaviour.

This has been discussed here before:

ATMega328P - 3.3v vs 5v, and 8Mhz vs 16Mhz

Also, do not think that you are tied to using 16MHz with 5v and/or 8MHz at 3.3v. All the OEM “ATmega328” hardware (bar the Arduino emontx-shield) are running at 3.3v with an external 16MHz xtal. Even the pro-mini’s CAN be 3.3v 16MHz (the’re the ones I use generally, although it’s been a while since I have) despite most info telling you otherwise. You need to hunt them out and be sure of what you are buying (vs what you get supplied) when looking at auction sites etc. I haven’t looked recently,…