Aside from the Nano it has an SD card and associated level shifter, and an SSD1306 i2c screen. Most of the Arduino’s lines drive the floppy interface, so the five-button control comes to a ...

Arduino SD card shield that includes an external 5v-3v3 level shifter. ... You browse your hardware store and buy the cheapest SD card module ... so that this is not a problem when you use them (like ...