PWM pins work the same way across all Arduino boards, so you don't need to go out of your way to buy a Mega if you already have a board supporting PWM. On the Uno, Nano, and Mini, the PWM pins are ...

I then outputs via I2C a HIGH (value 0 - different to Arduino) to turn ON the LED. If the above statement seemed a bit odd, remember that the PCF8574 will SINK the current, not source it, so we have ...

Pin 2 on the Arduino schematic is really GPIO2 on the NINA, therefore it should not be labeled GPIO34. This is confirmed by the fact that the pin numbering on the Arduino schematic matches the pin ...

Enter the ExtraCore library for Arduino, a software library that turns two or more Arduinos into a multi-core microcontroller with more pins than you’ll ever need.

The whole thing worked because of all the generous people who have written Arduino code, and also code to adapt the basic Arduino stuff to work with alternative chips from the Microchip was Atmel) AVR ...