Seeed Studio XIAO ESP32S3 Development Board Dual-Core WiFi BLE 8MB Flash Onboard Antenna for Arduino MicroPython

Specifications

• Microcontroller: Espressif ESP32-S3 (Xtensa 32-bit LX7 dual-core, up to 240 MHz)
• Wireless Connectivity: 2.4 GHz Wi-Fi (802.11 b/g/n) and Bluetooth 5.0 (BLE)
• Flash Memory: 8MB SPI Flash
• PSRAM: 8MB Pseudo-Static RAM
• Antenna Type: Onboard 2.4 GHz PCB antenna
• Operating Voltage: 3.3V DC (I/O logic level)
• Input Supply Voltage: 5V DC via USB Type-C or 3.7V DC nominal via battery pads.
• Battery Charging Current: 50mA (Fast) / 3.8mA (Trickle).
• Digital I/O Pins: 11 GPIO pins (all PWM capable)
• Analog Inputs: 9 ADC channels
• Communication Interfaces: 1× UART, 1× I²C, 1× SPI
  
• LED Indicators: 1× User LED, 1× Charge LED

Safety Warnings

• Logic Voltage Restriction (3.3V Max): The ESP32-S3 GPIO pins operate strictly at 3.3V logic levels. Connecting 5V digital signals or analogue sensors directly to any GPIO pin will permanently destroy the microcontroller's internal silicon. Always use a bi-directional logic level converter when interfacing with 5V components.
• Battery Polarity Caution: When soldering a 3.7V LiPo battery to the underside battery pads, double-check positive (+) and negative (-) terminal pads carefully. The onboard charging circuit lacks reverse polarity protection; inverted connections will instantly damage the charge management IC.

Accessories Included in the Box

• 1× Seeed Studio XIAO ESP32S3 Development Board (Standard Edition with Onboard PCB Antenna)
  
• 2× 7-pin 2.54mm pitch male header strips 

Frequently Asked Questions

• Can the XIAO ESP32S3 be programmed directly in the Arduino IDE?
  Yes, the Seeed Studio XIAO ESP32S3 is fully supported in the Arduino IDE by adding the official Espressif or Seeed Studio board manager URL in preferences and selecting "XIAO_ESP32S3" from the board manager list.
• Is this board compatible with CircuitPython and MicroPython?
  Yes, the Seeed Studio XIAO ESP32S3 officially supports both MicroPython and CircuitPython by flashing the pre-compiled firmware image via esptool or loading UF2 bootloader binaries over the native USB Type-C port.
• Can I use standard 5V Arduino shields or sensors directly with this board?
  No, the ESP32-S3 GPIO pins operate strictly at 3.3V logic levels, so connecting 5V digital or analogue signals directly will damage the microcontroller; always place a bi-directional logic level shifter between 5V peripherals and the board.
• Will code written for the classic XIAO SAMD21 or XIAO RP2040 run on this board?
  Standard Arduino API functions like digitalRead, analogWrite, and Wire work seamlessly, but architecture-specific hardware registers, RP2040 PIO routines, or SAMD timer interrupts must be rewritten using ESP-IDF or ESP32-S3 driver libraries.
• What is the maximum safe input voltage for powering the XIAO ESP32S3 via the 5V and Battery pins?
  The USB-C port and 5V pin accept regulated 5V DC (4.75V to 5.25V), while the underside battery solder pads are designed strictly for a single-cell 3.7V nominal (4.2V max charged) Lithium-Polymer or Li-ion battery.
• Can the board charge a connected 3.7V LiPo battery while running on USB power?
  Yes, the integrated battery charge management IC automatically powers the Seeed Studio XIAO ESP32S3 from the 5V USB-C bus while recharging a connected 3.7V LiPo battery at a default charge current of 50mA.
• How low is the power consumption during ESP32-S3 deep sleep mode?
  When configured for deep sleep with Wi-Fi and Bluetooth radios powered down, the Seeed Studio XIAO ESP32S3 consumes approximately 14µA to 25µA, making it ideal for battery-operated remote IoT sensor nodes.
• Why does Serial.print() not output anything to the Arduino Serial Monitor over USB?
  In the Arduino IDE Tools menu, you must set "USB CDC On Boot" to "Enabled", otherwise the native ESP32-S3 USB port will not route serial debug text to the computer console after bootup.
  
• How do I enable and allocate the 8MB onboard PSRAM in Arduino or ESP-IDF? In the Arduino IDE Tools menu, set "PSRAM" to "OPI PSRAM", and allocate large memory buffers in your sketch using ps_malloc() or heap_caps_malloc() to leverage the full 8MB external RAM.