Storage & SD¶

Apps live in the Cyber Fidget's internal storage, and their art is compiled into each app when it is built. The microSD card holds music, voice recordings, and the companion page; it does not hold apps or supply their art.

Draft section

THIS SECTION IS STILL IN DRAFT

Recommended card specs¶

Spec	Recommendation
Format	FAT32 (required)
Size	1 GB – 32 GB (FAT32 max). Larger cards may need manual formatting to FAT32.
Speed	Class 4 or higher. Class 10 / UHS-I recommended for faster read/write.
Form factor	microSD (not full-size SD)

Tested brands

Phison-based cards in the 4–32 GB range work well. Avoid ultra-cheap no-name cards — they can have compatibility issues with SPI-mode access.

Formatting¶

Format your card as FAT32 before first use:

Windows: Right-click the drive → Format → FAT32. For cards > 32 GB, use a tool like Rufus or SD Card Formatter.
macOS: Disk Utility → Erase → MS-DOS (FAT).
Linux: mkfs.vfat /dev/sdX1

Use cases¶

Music - The card holds music files
Voice recordings - The card holds recordings made with Voice Notes
Companion page - The card holds the page used by the phone companion
File browsing - The WiFi web portal can list, upload, and download the card's files, which is the easiest way to move music and recordings on and off

Hardware details¶

The SD card connects to the ESP32 via SPI:

Pin	Signal
GPIO 5	SCK (clock)
GPIO 19	MOSI (data out)
GPIO 21	MISO (data in)
GPIO 8	CS (chip select)

The SD card shares the 3.3V_RGB power rail (GPIO 2 enable), so it is powered down when the AUX regulator is disabled in deep sleep.