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 ExtraCore library comes ...

Of course, I wasn’t content to just read the Google translation ... you have the same problem with the Arduino pins, too. If you are driving an output pin with the FPGA, you shouldn’t try ...

You'll typically see this when reading values from a pin, such as int temp = analogRead(A0). float - Similar to int but for numbers with decimals. You can read up on other elements in the Arduino ...