The ESP32-S3-MINI-1 is Espressif's compact ESP32-S3 module. On this site it is recorded where official board documentation pins it down: the -N8 variant (the part number Arduino prints) soldered on the Arduino UNO R4 WiFi, where it acts as the Wi-Fi 4 / Bluetooth 5 LE secondary MCU — 3.3 V, behind a logic-level translator, never the processor you program by default.
Start from the board: Arduino UNO R4 WiFi — the ESP header and the USB-bridge switching are documented there.
What this module decides on that board
- Radio, not main compute — Wi-Fi 4 (2.4 GHz) and BLE 5 through the built-in antenna; the main MCU is the RA4M1.
- Flash size from the part number — the N8 suffix (8 MB, no PSRAM) is read from the official tech-specs part number; the Espressif module datasheet is not yet an admitted source, so no further module-internal figures are asserted here.
Also known as: esp32-s3-mini-1-n8, s3-mini-1