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Microcontroller · Development Board
Adafruit ESP32-S3 Feather
A Feather-format ESP32-S3 board with native USB, Wi-Fi, Bluetooth LE, battery charging, and STEMMA QT.
Processor
Espressif ESP32-S3
Logic
3.3 V GPIO
Power
USB-C, Li-Po connector, USB/3V rail
Format
Feather module
Check before wiring
- ESP32-S3 boot straps and USB pins should not be pulled incorrectly at reset.
- GPIO is 3.3 V only.
- Some pins are tied to PSRAM/flash or onboard peripherals depending on variant.
Interfaces
GPIOI2CSPIUARTADCPWMUSBWi-FiBluetooth
Source-backed connector
Interactive pin map
Pin map
Connector
Feather 16+12 headers
USB at top, JST battery at top-left, component side up
Simplified technical illustration. Pin data is source-backed; verify against the linked documentation before wiring.
Hover, tap, or focus a pad to inspect a pin. Use arrow keys to move between pins.
- Standard Adafruit Feather form factor; ESP32-S3 GPIO from the official PrettyPins PDF.
- GPIO is 3.3 V only and is not 5 V tolerant.
- STEMMA QT SDA (GPIO3) / SCL (GPIO4) double as analog A6/A7; GPIO7 (I2C_POWER) gates the STEMMA QT port and pullups.
- Left header positions 1-16, right header positions 17-28 (continuing around the board).
All 28 pins (table)
| # | Signal | Role | Net | Also / notes |
|---|---|---|---|---|
| 1 | System | |||
| 2 | Power | 3V3 | ||
| 3 | Power | 3V3 | ||
| 4 | Ground | GND | ||
| 5 | ADC | GPIO18 | ||
| 6 | ADC | GPIO17 | ||
| 7 | ADC | GPIO16 | ||
| 8 | ADC | GPIO15 | ||
| 9 | ADC | GPIO14 | ||
| 10 | ADC | GPIO8 | ||
| 11 | SPI | SPI | GPIO36 | |
| 12 | SPI | SPI | GPIO35 | |
| 13 | SPI | SPI | GPIO37 | |
| 14 | UART | UART | GPIO38 | |
| 15 | UART | UART | GPIO39 | |
| 16 | GPIO | GPIO13 · onboard LED | ||
| 17 | Power | BAT | LiPo battery input (MAX17048 monitor) | |
| 18 | System | 3.3 V regulator enable | ||
| 19 | Power | USB | USB 5 V | |
| 20 | GPIO | GPIO13 · duplicate breakout / LED | ||
| 21 | GPIO | GPIO12 | ||
| 22 | GPIO | GPIO11 | ||
| 23 | GPIO | GPIO10 | ||
| 24 | GPIO | GPIO9 | ||
| 25 | GPIO | GPIO6 | ||
| 26 | GPIO | GPIO5 | ||
| 27 | I2C | I2C | GPIO4 | |
| 28 | I2C | I2C | GPIO3 |
Why it matters
- Official pinout shows Feather labels, ESP32 GPIO numbers, and STEMMA QT wiring.
- Native USB supports CDC and HID use cases.
- Good CircuitPython and Arduino support.
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