The Arduino Nano 33 IoT only supports 3.3V for inputs and outputs (IO pins) and it is not 5V tolerant like most of the other Arduino boards. Connecting more than 3.3V on IO pins will damage the board.

The Arduino Nano itself is the most basic and oldest ... you might think it comes with a lot more pins. However, their pinouts are surprisingly similar in most aspects. First off, they have ...