A more convenient Arduino Uno
-
I ran across this Keyestudio Arduino Uno which has a convenient feature: you can easily switch it from 5v mode to 3.3v mode. When working with radios, most of which take 3.3v, it turns out that's a very nice convenience. Just saying.The price is what it is, but it's the same price in the Keyestudio store on aliexpress.If anyone knows of a cheaper, equivalent board, that runs at 3.3v (with or without a switch) please post. I tend to use 3.3v pro mini's, but I don't believe they can handle quite as much power, and obviously the form factor is different. Connecting to a pro mini with either an FTDI or CP2102 is yet another hassle. -
Well, scratch all that. It apparently can supply only 50ma at 3.3v. Disappointing!
I suppose the way to do it would be to find a 3.3v LDO with decent current capability and the same footprint as the standard 5v LDO (and good heat dissipation!), and then do a swap on a generic board by desoldering the 5v LDO and soldering in the 3.3v LDO. And it would be cheaper as well.
Also, I do wonder if it handled switching from 16Mhz to 8Mhz when switching from 5v to 3.3v? Or does it run at 8Mhz regardless?
-
It says that it has a 16MHz oscillator, so it's most likely running at 16MHz either way. Definitely not in spec, but with a cheap clone like this, not surprising. Most people who buy it wouldn't be able to track down a weird bug that happens once in a while back to it running out of spec. Likely it will work okay on a bench, but I wouldn't put anything critical on it.
I wonder if it's a real Atmega328 on it, or some clone? No telling these days what you're gonna get.
-
I also have a few of such Arduino Unos with a 3.3V selection switch from the shop "Open Smart" on Aliexpress.
See picture at: https://michiel.vanderwulp.be/domotica/Modules/ArduinoUno/#open-smart-3-3v-5v-switchable-uno-specification-1
They work fine, also on 3.3V.But indeed, running it at 16MHz on 3.3V is out of spec...
-
I even managed to solder a nRF24L01+ to the board so everything works on 3.3Volt, and this node works fine.
This took a lot of scratching copper from the board...
Hello! It looks like you're interested in this conversation, but you don't have an account yet.
Getting fed up of having to scroll through the same posts each visit? When you register for an account, you'll always come back to exactly where you were before, and choose to be notified of new replies (either via email, or push notification). You'll also be able to save bookmarks and upvote posts to show your appreciation to other community members.
With your input, this post could be even better 💗
Register Login