I am wondering about the voltage of a GPIO pin. I am testing an Itsy Bitsy 32U4 3V using just the USB power. The GPIO pin voltage is 5V. Is this correct? I will be using a 3.3V power when installed to the circuit, what will the voltage the GPIO pin will be?
This pin interfaces to Raspberry PIso the max GPIO voltage can only be 3.3V.
Which pin are you testing ?
We also made the digital #5 pin extra special on this board, it connects to a level shifter so it is only an output but the output is that 'high logic'. Basically what this means is if you want to drive NeoPixels, a picky servo, or a high-dropout-voltage LED from this board, and you want a 5V-logic-level output, this pin is the one you should use!
The signal I am testing is on GPIO D5.
Is this the pin your talking about?
Yes
See the quote in my previous post
OK Thanks for sharing your wisdom with me 
The boss will not be happy because I have to redo the PCB board, and I'm glad I did install it.
Are there any other GPIO pins I should be careful about?
I am glad that I could help, but should perhaps own up that all I did was a Google search for " Itsy Bitsy 32U4 3V" which I had previously never heard of, then read the information on the page
Yes, rereading the Itsy Bitsy 32U4 3V overview (Overview | Introducing ItsyBitsy 32u4 | Adafruit Learning System), it plainly states this info about D5.
I am glad I do not connect it to Raspberry.
Using Google is a secret known only by a few old dudes.
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