Modifying the Arduino Uno R4: Making it 3.3V-Friendly

RE: Modifying the Arduino Uno R4: Making it 3.3V-Friendly

shabaz — Sat, 16 Sep 2023 23:14:53 GMT

A small additional optional modification:

The modification provides the 5V USB connection onto a wire end : ) This could be handy for the cases where, even if 3.3V logic levels are needed, a 5V supply might be wanted too. Obviously, this is limited to whatever the connected USB host will provide.

Incidentally, anyone noticed that the fancy silver positive and negative symbols on the Arduino Minima board are actually real pads (perhaps used for testing); they actually are electrically connected to the positive and negative rails!

RE: Modifying the Arduino Uno R4: Making it 3.3V-Friendly

Spain_mtg — Wed, 12 Jul 2023 08:52:19 GMT

Good tutotial, thanks.

RE: Modifying the Arduino Uno R4: Making it 3.3V-Friendly

DAB — Tue, 11 Jul 2023 19:09:29 GMT

Nice mod.

RE: Modifying the Arduino Uno R4: Making it 3.3V-Friendly

Fred27 — Tue, 11 Jul 2023 07:19:27 GMT

Oops. I forgot to say "nicely done" first. That's a very clear and manageable modification. I must admit I'm surprised that 5V logic levels are still a thing in 2023.

RE: Modifying the Arduino Uno R4: Making it 3.3V-Friendly

Fred27 — Tue, 11 Jul 2023 07:17:23 GMT

Can I suggest one more step? Label it clearly as modified so that when someone - maybe you, maybe someone else - grabs it from a drawer in a year's time they aren't left wondering why it doesn't work (or where that smoke is coming from).

RE: Modifying the Arduino Uno R4: Making it 3.3V-Friendly

navadeepganeshu — Tue, 11 Jul 2023 04:23:05 GMT

Nice workaround. Yeah, often this makes sense while Arduino has to be incorporated in a system all with 3.3V. Or even sometimes I've seen people use Arduino just as a 5V supply for LCD display,...haha

Between, those are pleasing images of the PCB rework. Which camera do you use for these captures?

RE: Modifying the Arduino Uno R4: Making it 3.3V-Friendly

misaz — Mon, 10 Jul 2023 22:44:16 GMT

MCU supports 1.8V also but this would be even more challenging [emoticon:c4563cd7d5574777a71c318021cbbcc8]