Unexpected Maker FeatherS3

Board
by Unexpected Makerum-feathers3≈ medium (~$15–50)

Also known as: FEATHERS3

Verify my boardCompareEdit on GitHub
Unexpected Maker FeatherS3 pinout
Pinout

Specifications

Radiosinherited from ESP32-S3

Wi-Fi
Wi-Fi 4 · 2.4 GHz
Bluetooth LE
BLE 5
Bluetooth Classic
no
802.15.4
no

USB

Native USB
yes

Board

Form factor
feather
Dimensions
52.3 × 22.9 mm
Battery connector
yes
Charging
yes

Display & extras

Extras
stemma-qt
Built onUnexpected Maker FeatherS3 BoardESP32-S3 SoC

ESP32-S3 board in the Adafruit Feather footprint: 16 MB flash, 8 MB PSRAM, LiPo header + JST PH charging, and two STEMMA QT / Qwiic ports.

Firmware for this board

No firmware recipes yet — help add one.

Notes

  • 16 MB external flash, 8 MB external PSRAM
  • Adafruit Feather footprint
  • LiPo battery via header + JST PH connector on top
  • Two STEMMA QT / Qwiic ports (one on each LDO)
  • USB connector type not stated on the cited spec matrix (omitted)
  • io.gpio_exposed=21 QUOTED: vendor page states "21x GPIO including castellated headers"
  • io.power_out QUOTED: vendor page states "2x 700mA 3.3V LDO Regulators"; LDO2 is described as "for you to use to connect external 3V3 modules, sensors and peripherals" (EN tied to IO39, auto-shuts down in deep sleep) -- rail_v/rail_ma_max reflect this external-use LDO2, not the shared LDO1
  • io.gpio_free=16 DERIVED: CircuitPython's board pin table (unexpectedmaker_feathers3/pins.c) maps the 21 header-labeled D-pins (D0,D1,D4,D5,D6,D9-D19,D21-D25) to GPIO {44,43,0,33,38,1,3,7,10,11,17,18,14,12,6,5,8,9,37,35,36} -- the count matches vendor's "21" exactly and excludes onboard-dedicated pins (GPIO2 VBAT sense, GPIO34 VBUS sense, GPIO39 LDO2/NeoPixel enable, GPIO40 NeoPixel data, GPIO41 antenna switch, GPIO4 ambient-light sensor, GPIO15/16 second STEMMA QT I2C) that carry no D-number. Subtracting esp32-s3's soc.reserved_pins present in that 21-pin set (strapping {0,3}: 2: usb_flash_tied {35,36,37}: 3 -- 5 total) gives 21 - 5 = 16

Verify my board

Reads the connected chip over USB and checks it against what esp-atlas cites for Unexpected Maker FeatherS3 — over Web Serial, no backend, nothing leaves your browser.

In-browser verify needs Web Serial: Chrome or Edge on a desktop. Safari, Firefox and phones cannot do it.

Serial monitor

Not connected.