Seeed XIAO BLE nRF52840 - Supports Arduino / MicroPython - Bluetooth5.0 with Onboard Antenna

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Seeed XIAO BLE is an ultra-small size, ultra-low power Bluetooth development board based on the Nordic nRF52840. It features an onboard Bluetooth antenna, onboard battery charging chip, and 21*17.5mm thumb size, which makes it ideal for IoT projects.




Get inspired!  To better support Internet of Things developers and enthusiasts to utilize this tiny yet feature-rich board, and accelerate the implementation of IoT industry, smart wear projects and TinyML. Seeed has launched a sponsorship event, manufacture your Seeed XIAO BLE prototype for free with Seeed Fusion PCBA service. Click here to apply now!


We have provided Grove Starter Kit for Seeed Studio XIAO with courses, supporting all Seeed Studio XIAO development boards, which will help new developers quickly to get started and then proceed to make interesting individual projects.


  • Powerful CPU: Nordic nRF52840, ARM® Cortex™-M4 32-bit processor with FPU operating at 64 MHz
  • Wireless capabilities: Bluetooth 5.0, NFC, and ZigBee module with onboard antenna
  • Ultra-small size: 21 x 17.5mm, Seeed Xiao series classic form-factor for wearable devices
  • Ultra-low sleep power: 5 μA, deep sleep model
  • Battery charging chip: BQ25101 chip supported lithium battery charge management
  • Rich interface: 1x Reset button, Ix UART, 1x IIC, 1x SPI, 1x NFC, 1x SWD, 11x GPIO, 6x ADC, 1x Three-in-one LED,1x User LED
  • Onboard 2 MB flash
  • Onboard PDM microphone and 6-axis IMU (only for XIAO BLE nRF52840 Sense)
  • Single-sided components, surface mounting design


As the first wireless product in the Seeed XIAO family, Seeed XIAO BLE has equipped a powerful Nordic nRF52840 MCU which is designed in a Bluetooth 5.0 module, built around 32-bit ARM® Cortex™-M4 CPU with Floating-Point Unit(FPU) operating at 64Mhz. With the capability of wireless connection, it still remains the Seeed XIAO series classic form-factor of small and exquisite which can be used for wearable devices and Internet of Things projects. Furthermore, it only costs 5 μA in the deep sleep model and it supports battery charge management because of the BQ25101 chip. To better support IoT and TinyML AI projects, there is an advanced version "Seeed XIAO BLE Sense" that carries both 6-axis IMU and PDM microphones. 


Compare to XIAO RP2040, XIAO BLE has a richer interface. The first thing to note is that the Near Field Communication(NFC) is functional on the board. Secondly, there is a tiny and elegant reset button on one side of the Type-C interface. On the other side, it is designed in a three-in-one LED along with a power LED. There are 11 digital i/o that can be used as PWM pins and 6 analog i/o that can be used as ADC pins. It supports UART, IIC, and SPI all three common serial ports. Same as Seeed XIAO RP2040, it has an onboard 2 MB flash which means it can also be programmed by Arduino, MicroPython, CircuitPython, or other program languages. 

XIAO BLE is compatible to the XIAO expansion board. 

If you are interested in programming embedded machine learning, we have Codecraft graphic programming that can help you quickly start your own TinyML project. And we have set up a #tinyml channel on our Discord server, please click to join for 24/7 making, sharing, discussing, and helping each other out. We can do this all day.



Seeed XIAO BLE - nRF52840

Seeed XIAO BLE Sense - nRF52840


  Nordic nRF52840

  The same as XIAO BLE

  ARM® Cortex®-M4 with FPU run up to 64 MHz


  Bluetooth 5.0/NFC/Zigbee

  The same as XIAO BLE

  On-chip Memory

  1 MB flash and 256 kB RAM

  The same as XIAO BLE

  Onboard Memory

  2 MB QSPI flash

  The same as XIAO BLE


  1xUART, 1xIIC, 1xSPI, 1xNFC, 1xSWD,

  The same as XIAO BLE

  11xGPIO(PWM), 6xADC



  Onboard PDM digital microphone

  Onboard 6-axis IMU


  21 x 17.5mm

  The same as XIAO BLE


  Circuit operating voltage: [email protected]

  The same as XIAO BLE

  Charging current: 50mA/100mA

  Input voltage (VIN): 5V

  Standby power consumption:  <5μA


  • Wearable devices
  • Wireless connect
  • Embedded machine learning projects
  • Perfect for mini Arduino projects
  • Tiny Machine Learning application

Hardware Pinout

Seeed XIAO Series

Seeeduino XIAO series product selection reference is provided here. The table compares Seeedino XIAO, Seeed XIAO RP2040, Seeed XIAO BLE and Seeed XIAO BLE Sense in detail in terms of processor, memory, interface, etc.

ItemSeeeduino XIAOSeeed XIAO RP2040Seeed XIAO BLESeeed XIAO BLE Sense
Processor SAMD21 [email protected] RP2040 Dual-core [email protected] nRF52840 [email protected] nRF52840 [email protected]
Wireless Connectivity N/A N/A Bluetooth 5.0/BLE/NFC Bluetooth 5.0/BLE/NFC
Memory 32 KB SRAM 256KB FLASH 264 KB SRAM 2MB onboard Flash 256 KB RAM, 1MB Flash 2MB onboard Flash 256 KB RAM,1MB Flash 2MB onboard Flash
Built-in Sensors N/A N/A N/A 6 DOF IMU (LSM6DS3TR-C), PDM Microphone
PWM/Analog Pins 11/11 11/4 11/6 11/6
Onboard Buttons N/A Reset/ Boot Button Reset Button Reset Button
Onboard LEDs N/A Full-color RGB/ 3-in-one LED 3-in-one LED/ Charge LED 3-in-one LED/ Charge LED
Battery Charge Chip N/A N/A BQ25101 BQ25101
Programming Languages Arduino/ CircuitPython Arduino/ MicroPython/ CircuitPython Arduino/ MicroPython/ CircuitPython Arduino/ MicroPython/ CircuitPython


All the I/O pins are 3.3V, please do not input more than 3.3V, otherwise, the CPU may be damaged.

Part List

Seeed XIAO BLE nRF52840x1
7 Pins Header x2


HSCODE 8543709990
USHSCODE 8471490000



This wiki will help you quickly get started with Seeed XIAO BLE.
On this page, the user provides a tutorial about controlling a WS2812B LED strip to make it shine in different colors with the XIAO BLE.
Get to know Wio Terminal TinyML Course #7 Machine Learning on ARM Cortex M0+ MCU Seeeduino XIAO and XIAO RP2040
The RP2040 is a 32-bit dual ARM Cortex-M0+ microcontroller integrated circuit by Raspberry Pi Foundation.
Wonder how you can pair and control your Arduino Board with Bluetooth? If so, you’re in the right place!
Have space constraints on your Arduino Project? Need a small Arduino board? However, there are so many small Arduino boards out there currently out there. Which one should you use?
Seeed XIAO BLE Sense & Seeed XIAO BLE Sense. These small-sized boards are specially designed for IoT and AI applications. This board is an ideal board to run AI using TinyML and TensorFlow Lite.
What is TensorFlow Lite ? Just heard of TensorFlow Lite and want to know more about it? Today we will discuss everything about TensorFlow Lite.
Implementing machine learning models running on small, low-power microcontrollers and incorporating them into your projects becomes more accessible and affordable.



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  1. Product Quality
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  2. Product Quality
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    Excellent quality and features, perfect for my use case as a bluetooth key fob.
  3. Product Quality
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  4. Product Quality
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    Documentation on the Seeed wiki is great; this board was cheap and worked well for my project. Will definitely be purchasing more of these! Love the tiny reset button. Only downside is that the battery pads aren't through hole, but that's a minor gripe.
  5. Product Quality
    from order view
    Excellent product !


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