Put a wav file (8bit, 32kHz) on the SD card, change the name and maybe the cooldown in the code (lines 11 and 24).

The instructions are for an arduino pro micro, it should work on any arduino using an atmega32u4 chip such as the leonardo. Simply upload Duckduino-microSD to your arduino, forma your microSD to FAT32 ...

So here’s the thing: Arduino’s built-in memory is tiny. If you’re just blinking LEDs, no problem. But the moment you try to log data, say battery usage, temperature over time, or GPS coordinates, ...