ESP32-S3 Zero / Super Mini Pinout

Boards sold as “ESP32-S3 Zero” or “ESP32-S3 Super Mini” are near-identical coin-sized ESP32-S3 breakouts from several sellers, Waveshare’s own ESP32-S3-Zero is the most established and best-documented version, this guide is sourced from Waveshare’s own documentation. If your specific board came from a different seller, double-check its silkscreen labels against the table below before wiring anything, minor differences between clones are common.

System-on-chip and board

Built around the same ESP32-S3 chip as this site’s AI-S3 board: dual-core Xtensa LX7, Wi-Fi 802.11 b/g/n, Bluetooth 5 LE, native USB. This specific board is 23.5×18mm, single USB-C port, an onboard WS2812 addressable RGB LED, a BOOT button, and 4MB flash with 2MB of quad-SPI PSRAM (must be explicitly enabled in firmware, it isn’t used automatically).

GPIO reference

Real gotchas

• GPIO33–37 genuinely don’t exist on this board’s header, even though the ESP32-S3 chip itself has them, they’re wired internally to the onboard PSRAM. Don’t design around them being available, unlike some other ESP32-S3 boards that do expose them.
• PSRAM isn’t automatic. The 2MB of onboard PSRAM only becomes usable once your build explicitly enables it (in Arduino IDE: Tools → PSRAM → “OPI PSRAM”; in ESP-IDF: the relevant `menuconfig` option).
• Seller variation. Because “ESP32-S3 Zero” and “ESP32-S3 Super Mini” aren’t a single manufacturer’s trademarked product, always check your specific board’s silkscreen against this table rather than assuming an exact match.

Conclusion

This is the smallest, cheapest way to get a full ESP32-S3 with native USB and PSRAM onto a breadboard. For a larger board with dual USB-C and a built-in USB-serial adapter dedicated purely to flashing, see the AI-S3.

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