The pins A4 and A5 have an internal pull up and are designed to be used as an I2C bus. So, usage of A4 and A5 as analog inputs is not recommended. According to the box, the Arduino Nano 33 IoT can be ...

On the Nano, you can access one UART (pins D0 and D1 as RX and TX), one SPI (pins D10 to D13 as SS, MOSI, MISO, and SCK), and one I2C/TWI (pins A4 and A5 as SDA and SCL). The Pico, however ...

That is all still true, but what [Larry Bank] discovered is a way to get multiple OLED displays working with considerably fewer microcontroller pins than usually needed. While bit-banging I2C to ...

Use I2C to communicate between two Arduino Nano 33 BLE Sense. Square a number at the other Arduino and send the result back. See this tutorial for hardware and software set up. Everything is the same ...