FeatherS3 ESP32-S3

Overview

The FeatherS3 by Unexpected Maker is a high-specification ESP32-S3 development board in the Adafruit Feather form factor. It carries 16 MB of QSPI Flash and 8 MB of QSPI PSRAM, two 700 mA 3.3 V LDO regulators for clean power separation between MCU and sensor loads, and 21 GPIO pins — more than any other standard Feather-compatible ESP32-S3 board.

Two STEMMA/Qwiic connectors provide immediate I2C sensor access without soldering. The ESP32-S3's native USB and USB Serial JTAG share the USB-C port, enabling UF2 drag-and-drop firmware updates alongside traditional JTAG debugging. A low-power RGB LED, power and charge indicator LEDs, and a 3D high-gain antenna round out the hardware.

LiPo battery charging is built in, and the board exposes both VBAT and 5 V sense pins so user code can monitor power-supply state. The ultra-low deep sleep current makes the FeatherS3 practical for battery-powered WiFi/BLE sensor nodes that wake periodically.

Firmware options include CircuitPython (shipped pre-loaded with UF2 bootloader), MicroPython, Arduino 2.0.3+, and ESP-IDF. The Feather footprint gives access to the entire FeatherWing ecosystem of display, cellular, GPS, and audio add-on boards.