Power VIN with 3.3V and get data through USB

Official Hardware MKR Family MKR FOX 1200
1

Hi everyone!

First of all let me introduce my project. Few days ago I've started with a Sigfox tracking system with sensors and modules that can work at 3.3V (which means it's perfect 'cause no level shifter is needed). Days before I've powered the MKR1200 with a 3.3V power supply at pin VIN successfully although documentation tells to power it with 5V.

My intention is to go for a walk and keep positions every half minute to check the GPS module and recover the info plugging the USB then plotting it to a file to check what happened.

So my question is: Will the MKR1200 switch to VIN (@3.3V) when USB (@5V) plugged? If it doesn't do, could I damage my board?

Thanks for reading!

Regards,

2

Hi everyone again!

Finally I've toke the risk to test the board with the most stupid test made by humans. Connect and pray.

First of all, I plugged my power supply @3.3V to VIN and GND to power up my board and finally the USB. I detect that was powered up with VIN because a small difference in voltages that power different electronic parts of the board.

Ciao!

3

Hi!

What do you mean with "switch to VIN (@3.3V) when USB (@5V) plugged?". I don't really understand what is your point (it could be my lack of english :slight_smile: )