Hello, can someone please confirm the logic level of the Arduino Uno and/or point me to official documentation that can prove it? I am seeing 5V and 3.3V depending on the source. Thank you!
The Arduino Uno is a 5V board. Its digital outputs can be 0V or 5V.
What sources would say otherwise ?
The official Arduino Uno is a 5V board, but some make a board with a switch that can select 3.3V or 5V. That is not a very good choice, since the microcontroller needs 5V to run at 16 MHz.
Everything is open source. This is the page for the Arduino Uno: https://store.arduino.cc/products/arduino-uno-rev3/
Scroll down for the schematic in pdf.
Please can you confirm that you read this before posting here?
(Why not?)
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No, I cannot confirm because I hadn't seen that. Where would you recommend posting a question like that?
Electronics?
Guidance?
(Why did you think what you were posting even remotely resembled a tutorial?)
The UNO rev3 is a 5v PCB.
For input Hi/Lo logic levels, look at the 328P data sheet around page 415.
The Electronics Forum might be a good place 
I didn't think it resembled a tutorial. I posted it in a section of the forums geared towards new people on the forum. I really don't appreciate the way your addressing this. If it were me, I would just point someone who created a potentially misclassified post in the right direction, you might gain more respect from your peers if you did.
Fixed that for you.
Thank you Larry, this is extremely helpful!
Thank you Koepel, this very helpful
A section of the forum with two, prominent, in capitals sticky topics asking you not to post questions?
(I should know, I wrote them)
We finally learn who is this mysterious @system user!
Mark 5:9
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