Thanks to both :)

@ajb2k3 : as written also by @felmue I want to power all my system with 3.3V so there won't be around any 5V at all !

Of course I need to check the specific schematic in order to understand what to bypass, but my question was if the white enclosure of M5Stack modules (like the I2C hub, or the heart rate sensor) can be easily open - without damaging / breaking them - or not (is there something like a screw?).

Any clue about that?

thanks!

Hi @felmue

and thanks for your reply, appreciated. I knew it was simple but I wanted confirmation :)
Regardless of this, thanks for pointing me out where to find all documentation, including schematics.

So I have another question: are the modules "possible to open"?
I mean, I saw some modules interesting for my project (heart rate sensor) and their schematic show that there is a LDO regulator from the +5V to the +3v3 of the IC.
I was wondering if it was possible to safely open the white plastic package, bypass the LDO so that I can feed the sensor directly with the +3v3 I have on the I2C VCC line.

Thanks if you (or anybody else!) can answer my doubt.

Hi there,

I am planning to use the "1 to 3 HUB Expansion Unit" (https://m5stack-store.myshopify.com/products/mini-hub-module) in my project where I have some Seeedstudio grove modules driven by a 3.3V Arduino.

My question is: which is the range of power supply which can be given to the "5V" pin?
If I supply it with 3.3V (my whole system is 3.3V, no 5V around) will it work?

Sorry for the silly question but I didn't find this info anywhere.

thanks to who will help me!