I was wondering if it would be possible to directly supply the Arduino Nano 33 IOT 3.3V on the 3.3V pin? Indeed, for my project I need to power the Arduino with 2 AA batteries, and I feel that it is kind of a waste to boost the 2 cells voltage to 5V (or similar) to to have it regulated down to 3.3V. Especially as I would like to save as much battery as I can for the project to last longer.
From what I saw on the schematic (see the attached file), the MPM3610 doesn't have any kind of protection (diode or similar). Would it be an issue?
Also I don't plan on uploading code while the Arduino is powered by the 2 cells ( I think it would be an issue in that case).
Does your project need to be on a Nano IoT? I ask because the latest Nano BLE's have a solder pad that you can cut to supply them with 3.3V batteries, see here for more details. Looks like cutting it disconnects the OUT of the MPM3610.
@Dozie understood. I guess there are no easy work around. @matt_lee_smith thank you very much for your suggestion. However I need to use Wi-Fi for this project. Nonetheless, I will keep that in mind if Bluetooth instead of Wi-Fi is required .
Once again, thank you both very much for your feedback. It was highly appreciated and very helpful!
@Klaus_K Sadly I can't share much information as it is meant to be used for a professional project. I know Wi-Fi is power hungry. However it doesn't require a 8000$ license like Bluetooth does. Otherwise I would have probably gave it a try.
Sorry I can't disclose much more information about the project . Hope you understand.
BLE is a mass product technology, where $8000 is divided by large volumes. Using it for 100 units is unfortunately often prohibitively expensive.
I understand you cannot share any details about the product itself. Could you still share some general information about the active time and battery life you expect? e.g., connect once a day/hour ..., active for x minutes, lifetime y month/weeks ... ?
From my calculations it should be theoretically meet the requirements, but I wanted to check if I could make that more efficient. If that would I would be able to considerate AAA batteries (for size matters) and such .
That is interesting. May I ask what kind of power supply regulator and battery are you using?
I am a bit curious as it goes against the recommendation from a tech support member (@Dozie ). But maybe in the long run it is to follow @Dozie 's advice. That is why I would like to ask for confirmation
Thank you all very much for your feedback, I highly appreciate it!
@Dozie I can see that. Is it similar to the raspberry pi where it is possible supply the board directly with 3.3V, but there is no protection unlike the recommended input pins/methods? So if there a voltage spike or such it will damage the board.
I am asking as based on @indyvh100 feedback, it seems possible to power the board directly through the 3.3V pin, as long as I don't use Vin and VUSB at the same time. Which makes sense as if both the MPM3610 and the other DC-DC converter I wish to use are not working at the same 3.3V, it might generate short-circuit / instabilities.