“ESP32 DevKit” covers a dozen subtly different boards. This is a field guide to what actually arrives — USB bridge chip, flash size, usable GPIO, and which pins lie about being free.
| board | usb | flash | notes |
|---|---|---|---|
| WROOM-32 “38-pin” | CP2102 | 4 MB | best default |
| WROOM-32 “30-pin” | CH340 | 4 MB | fewer GPIO |
| WROVER | CP2102 | 4 MB + PSRAM | for camera |
| “extra cheap” clone | CH9102 | sometimes 2 MB | check first |