Seeed Studio XIAO ESP32S3 packs a dual-core ESP32-S3 with 8 MB PSRAM and 8 MB flash into a thumb-sized format. The extra memory is useful for audio, voice recognition or simple machine learning.
The Sense version adds a detachable camera, a microphone and a microSD slot.
Specifications
ESP32-S3 : 2× Xtensa LX7 up to 240 MHz, 8 MB PSRAM8 MB flash
Wi-Fi 4 (2.4 GHz) and Bluetooth 5 (LE), external antenna (U.FL)
11 GPIO on the headers plus more pads on the bottom, 9 analog and 9 touch inputs
UART, I2C, SPI and PWM, USB-C with native USB
Li-Po cell charging, orange LED on GPIO21 (lights up at logic 0)
3.3 V output up to 700 mA, 21 × 17.8 mm
The headers have the same layout as the other XIAO boards. The pads on the bottom break out additional GPIO (on the Sense version, some of them are used by the camera).
Pinout and pin table
Hover over a pin in the diagram or a table row; use the filter to highlight a bus. You can download the pinout as PNG or SVG.
All UART I2C SPI ADC Touch Strapping Power GND Control
Pin names: Chip Arduino CircuitPython
Plan wiring
Top side Bottom side
Pin table – Seeed Studio XIAO ESP32S3 Pin Name Arduino Direction UART I2C SPI ADC Touch Note 1 GPIO1 D0/A0 input/output ADC1_CH0 T1 2 GPIO2 D1/A1 input/output ADC1_CH1 T2 3 GPIO3 D2/A2 input/output ADC1_CH2 T3 Strapping pin (JTAG source selection) – has no effect unless set in eFuse 4 GPIO4 D3/A3 input/output ADC1_CH3 T4 5 GPIO5 D4/A4 input/output SDA ADC1_CH4 T5 6 GPIO6 D5/A5 input/output SCL ADC1_CH5 T6 7 GPIO43 D6 input/output TX UART0 TX 8 GPIO44 D7 input/output RX SS UART0 RX; also the default SS for SPI in Arduino 9 GPIO7 D8/A8 input/output SCK ADC1_CH6 T7 10 GPIO8 D9/A9 input/output MISO ADC1_CH7 T8 11 GPIO9 D10/A10 input/output MOSI ADC1_CH8 T9 12 3V3 output 3.3 V output, max. 700 mA 13 GND – 14 5V input/output 5 V from the USB connector. It can also power the board – ideally connect the supply through a diode so voltage does not flow back into USB. Bottom side GPIO40 input/output JTAG MTDO Bottom side GPIO41 input/output JTAG MTDI Bottom side GPIO39 input/output JTAG MTCK Bottom side GPIO42 input/output JTAG MTMS Bottom side GPIO20 input/output ADC2_CH9 USB D+ – used by USB, do not use as GPIO Bottom side GPIO19 input/output ADC2_CH8 USB D− – used by USB, do not use as GPIO Bottom side EN input Reset – connecting to GND restarts the chip Bottom side GND – Bottom side BAT+ input/output 3.7 V Li-Po cell positive – the board charges it from USB Bottom side BAT- – Cell negative (GND)
Pins used on the board
These chip pins are used by parts on the board and are not broken out:
Pin Function on the board GPIO0 Button B (BOOT) GPIO21 User LED (lit at logic 0)
What to watch out for
The GPIO are not 5V tolerant. Use a level shifter for 5V signals.GPIO19 and GPIO20 are USB D− and D+ – do not use them as GPIO.
Wi-Fi barely works without the antenna connected.
Under heavy load (Wi-Fi, camera), the board gets noticeably hot.
Only connect a 3.7 V Li-Po/Li-Ion cell to the BAT pads.
Related projects on chiptron.eu/
On chiptron.eu/ you will find these related projects and tutorials:
ESP32 Bit Pirate MeshCore 100 IoT projects ESP-Scope Linux on ESP32-S3
More pinouts
ESP32-WROOM-32 (modul) ESP32 · Wi-Fi + Bluetooth · 26 GPIO ESP32 module with 38 pads – the heart of DevKits and most ESP32 devices (WROOM-32, -32D, -32E). ESP32 DevKit V1 (30pin) ESP32 · Wi-Fi + Bluetooth · micro USB · 25 GPIO The most common cheap ESP32 board (WROOM-32 module) with 30 pins. ESP32-DevKitC (38pin) ESP32 · Wi-Fi + Bluetooth · micro USB · 26 GPIO Official Espressif board with ESP32-WROOM-32 and 38 pins; NodeMCU-32S has the same pinout. ESP32-CAM (AI-Thinker) ESP32 · Wi-Fi + Bluetooth · 10 GPIO ESP32 with an OV2640 camera, microSD slot and flash LED – which GPIOs remain free and how to program the board. ESP32-S3-DevKitC-1 ESP32-S3 · Wi-Fi + Bluetooth LE · micro USB · 36 GPIO Official ESP32-S3 board: two USB-C, RGB LED and 44 pins. ESP32-C5-DevKitC-1 ESP32-C5 · Wi-Fi 6 2,4/5 GHz + Bluetooth LE + Zigbee/Thread · USB-C · 22 GPIO Official ESP32-C5 board: dual-band Wi-Fi 6, Bluetooth LE and Zigbee/Thread, two USB-C and an RGB LED. ESP32-C6-DevKitC-1 ESP32-C6 · Wi-Fi 6 + Bluetooth LE + Zigbee/Thread · USB-C · 23 GPIO Official ESP32-C6 board: Wi-Fi 6, Bluetooth LE and Zigbee/Thread, two USB-C and an RGB LED. ESP32-C3 Super Mini ESP32-C3 · Wi-Fi + Bluetooth LE · USB-C · 13 GPIO Tiny ESP32-C3 (RISC-V) board with USB-C and a ceramic antenna. Seeed Studio XIAO ESP32C3 ESP32-C3 · Wi-Fi + Bluetooth LE · USB-C · 11 GPIO Thumb-sized ESP32-C3 board with a Li-Po charger and an external antenna connector. Waveshare ESP32-S3-Touch-LCD-2.1 ESP32-S3 · Wi-Fi + Bluetooth LE · USB-C · 7 GPIO 2.1" round touch display with ESP32-S3 – connectors on the back: 12 pins, I2C and UART. Seeed Studio XIAO ESP32C6 ESP32-C6 · Wi-Fi 6 + Bluetooth LE + Zigbee/Thread · USB-C · 16 GPIO Thumb-sized ESP32-C6 board (Wi-Fi 6, Zigbee, Thread) with an antenna switch and a Li-Po charger. LOLIN S2 Mini ESP32-S2 · Wi-Fi · USB-C · 27 GPIO D1 mini-sized board with ESP32-S2 and USB-C: 27 GPIOs in two double rows. LaskaKit Meteo Mini v4.1 ESP32-C3 · Wi-Fi + Bluetooth LE · USB-C · 8 GPIO ESP32-C3 weather station: μŠup connectors for sensors, battery and solar panel. ESP32-S3 Super Mini ESP32-S3 · Wi-Fi + Bluetooth LE · USB-C · 35 GPIO Tiny ESP32-S3 board with 2 MB PSRAM, a Li-Po charger and 20 GPIO on pads underneath. LaskaKit ESPink v3.6 ESP32-S3 · Wi-Fi + Bluetooth LE · USB-C · 25 GPIO E-paper board with ESP32-S3: J1 and JP1 headers, μŠup I2C and SPI, battery. Waveshare ESP32-S3-Zero ESP32-S3 · Wi-Fi + Bluetooth LE · USB-C · 26 GPIO Tiny ESP32-S3 board: USB-C, RGB LED, 4 MB flash, 2 MB PSRAM and pads underneath. LILYGO T-Deck ESP32-S3 · Wi-Fi + Bluetooth LE + LoRa · USB-C · 2 GPIO Pocket ESP32-S3 with keyboard and LoRa: Grove connector (UART) and an overview of used pins. LILYGO T-Beam V1.2 ESP32 · Wi-Fi + Bluetooth + LoRa · micro USB · 17 GPIO ESP32 with LoRa, GPS and an 18650 cell for Meshtastic: two 13-pin headers and an overview of used GPIOs. LaskaKit ESP32-LPkit v2.4 ESP32 · Wi-Fi + Bluetooth · USB-C · 26 GPIO LaskaKit low-power ESP32 board: headers J1 and J2, μŠup I2C, battery with charger. LaskaKit ESP32-C3-LPKit v4.0 ESP32-C3 · Wi-Fi + Bluetooth LE · USB-C · 12 GPIO LaskaKit low-power ESP32-C3 board in D1 mini size: two headers, μŠup I2C and SPI, battery. Heltec WiFi LoRa 32 V3 ESP32-S3 · Wi-Fi + Bluetooth LE + LoRa · USB-C · 28 GPIO ESP32-S3 with LoRa SX1262 and OLED display – the most widespread board for Meshtastic and MeshCore. Waveshare ESP32-P4-ETH ESP32-P4 · USB-C · 27 GPIO ESP32-P4 with Ethernet, MIPI-DSI/CSI and audio: 2 × 20 header in the Pico layout, 27 GPIOs. Heltec WiFi LoRa 32 V4 ESP32-S3 · Wi-Fi + Bluetooth LE + LoRa · USB-C · 32 GPIO ESP32-S3 with LoRa SX1262 (up to 28 dBm), OLED display and a GNSS connector – popular for Meshtastic. See all pinouts on the Pinouts page.
