Add ESP32-S3 Box 3 board page

_board/espressif_esp32s3_box_3.md

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+---
+layout: download
+board_id: "espressif_esp32s3_box_3"
+title: "ESP32-S3 Box 3 - 16MB Flash, 16MB PSRAM"
+name: "ESP32-S3 Box 3"
+manufacturer: "Espressif"
+board_url:
+ - "https://www.adafruit.com/product/5835"
+board_image: "espressif_esp32s3_box_3.jpg"
+date_added: 2026-09-21
+family: esp32s3
+features:
+  - Wi-Fi
+  - Bluetooth/BTLE
+  - Display
+  - Speaker
+  - USB-C
+---
+
+The **ESP32-S3-BOX-3** is Espressif's updated AI voice development kit and the successor to the original ESP32-S3-BOX. It has a 2.4-inch 320x240 capacitive touch display, two digital microphones, an ES8311 speaker codec, and 16MB flash with 16MB octal PSRAM on the ESP32-S3.
+
+The kit ships with the ESP32-S3-BOX-3-DOCK, a stand with two Pmod-compatible headers (16 programmable GPIOs) and a USB-A host port. Espressif also offers the ESP32-S3-BOX-3-SENSOR accessory, which adds temperature/humidity sensing, an IR emitter and receiver, a 24GHz radar sensor, an 18650 battery holder with charging, and a microSD card slot. The ESP32-S3-BOX-3-BREAD and -BRACKET adapters expose the same GPIOs for breadboards and mounting.
+
+* [ESP32-S3-BOX-3 hardware overview](https://github.com/espressif/esp-box/blob/master/docs/hardware_overview/esp32_s3_box_3/hardware_overview_for_box_3.md)
+* [Getting started with the ESP-BOX](https://github.com/espressif/esp-box/blob/master/docs/getting_started.md)
+
+## Purchase
+
+* [Adafruit](https://www.adafruit.com/product/5835)