This library has been tested with an Arduino Uno (AtMega328p), EnviroDIY Mayfly (AtMega1284p), Adafruit Feather 32u4 (AtMega32u4, identical to Arduino Leonardo), ... Note that different AtMega1284p ...

This may be an ATmega32U4 device (Micro, Pro-Micro and variations) or ATmega328P device (Uno, Nano) The connections required are simple, go to the Hardware Interface section for details and diagrams; ...