Qwiic Pro Micro running 3.3 Volts

Development Boards Arduino
1

Is anyone running a Qwiic Pro Micro using 3.3 volts? I have a device I need to communicate with that is completely 3.3 volts. I already have everything working on a development redboard that has both 3.3 and 5V. I tried switching the circuit to the Qwiic Pro Micro, cut the 5V trace, jump to the 3.3V pad (3.3 is measured on the 5V pin, as expected). The board is recognized by my computer, the Arduino GUI is set to the 3.3 version of the board, and as soon as I flash the software, the board gets bricked and does nothing after that.

I pulled out a second Qwiic Pro Micro that was my backup, and viola - same reaction. Do these boards actually work on 3.3V, or does that feature not work?

Thanks

2

This is unusual. Ain’t it? Let’s see what sparkfun has to say.

3

Even when you change the jumper to 3.3 volts, the board is still thinks it’s a 5 volt board and needs the 5 volt board setting in arduino. Set the IDE back to the 5 volt board and check the troubleshooting section in the hookup guide where it talks about “reset to bootloader” and that should get things working again.