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Seeed Studio XIAO nRF52840 - Supports Arduino / CircuitPython- Bluetooth5.0 with Onboard Antenna


Seeed Studio XIAO nRF52840 by Nordic is carrying wireless capability for the first time and it supports Bluetooth 5.0, also able to operate with low power consumption. It will be your best microcontroller for Bluetooth applications.

In stock
  • 10+: $8.99



Pins are not included in this product. If you require the pins, please visit the following page to make a purchase. Alternatively, you can select the pins from the 'Also Add' section.

Seeed Studio XIAO Series are diminutive development boards, sharing a similar hardware structure, where the size is literally thumb-sized. The code name "XIAO" here represents its half feature "Tiny", and the other half will be "Puissant".

Seeed Studio XIAO nRF52840 is carrying wireless capability for the first time and it supports Bluetooth 5.0, also able to operate with low power consumption. It will be your best microcontroller for Bluetooth applications.



  • Versatile Microcontroller: Incorporate the Nordic nRF52840 chip with FPU, operating up to 64 MHz, mounted multiple development ports, supported by Arduino / CircuitPython
  • Wireless Capabilities: Implement Bluetooth 5.0, BLE functions with onboard antenna, also provide NFC connectivity
  • Elaborate Power Design: Provide ultra-low power consumption as 5 μA in deep sleep mode while supporting lithium battery charge management
  • Thumb-sized Design: 21 x 17.5mm, Seeed Studio XIAO series classic form-factor, suitable for wearable devices
  • Perfect for Production: Breadboard-friendly & SMD design, no components on the back




Seeed Studio XIAO nRF52840 has an ultra-low power consumption of only 5 μA in the deep sleep mode, the embedded BQ25101 chip supports battery charge management which prolongs its use time. Moreover, Seeed Studio XIAO nRF52840 supports the USB Type-C interface which can supply power and download code. It also has rich On-chip Memory of 1 MB flash and 256 kB RAM, and an Onboard Memory of 2 MB QSPI flash. 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. 1 Reset button, 1 3-in-one LED, 1 Charge LED, and 1 Bluetooth antenna are on board, allowing developers to debug their code very easily. 

The powerful performance makes it perfect for machine learning applications, and the tiny size allows it to be used in wearable devices and Internet of Things projects, not just for prototypes but the mass production. Furthermore, Seeed Studio XIAO nRF52840 is friendly to the communities for its strong software compatibilities, which support Arduino, Micropython, and CircuitPython. Except for the software, flexible I/O allows it to speak to almost any external device.



XIAO SoM User Manual open-sources all hardware and software materials of XIAO, providing professional product design guidelines to help you accelerate ideas off the ground, streamline product design, providing a seamless experience from module selection to mass production. You can check here to see more info.


Starter Kit with free Course for all Electronics Neophytes and Enthusiasts

Seeed Studio has provided the Grove Starter Kit along with free and detailed courses for you quickly get started with microcontrollers and electronics, regarding all the Seeed Studio XIAO boards, promising you a great learning experience.

Not only programming but also electronics knowledge is not required, you will be taken step by step, from understanding the basic concepts to exercising the simple projects individually, finally being able to build complex, interesting, wearable projects on your own, owing a practical electronic product prototype from the course.

You can have access to the Seeed Studio Grove ecosystem by connecting it to the compatible Seeed Studio XIAO expansion board. We have developed more than 400 Grove modules, covering a wide range of applications that can fulfill various needs. For example, you can make a BLE AI-driven Smartwatch Detecting Potential Sun Damage by connecting the Seeed Studio XIAO nRF52840 with an expansion board, and a Grove - UV Sensor. Get started and explore the infinite possibilities of the Seeed Studio XIAO series!

If you are interested in programming embedded machine learning, we have Codecraft visual 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 already have 5 XIAO products based on different solutions in the XIAO family, to help you better understand the differences and choose the most suitable part for your projects, please refer to the Seeed Studio XIAO Series Page.


To better support IoT and TinyML AI projects, there is an advanced version "Seeed Studio XIAO nRF52840 Sense" that carries an extra 6-axis IMU and a PDM microphone. 


Seeed Studio XIAO nRF52840

 Seeed Studio XIAO nRF52840 Sense


  Nordic nRF52840

  The same as Seeed Studio XIAO nRF52840

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


  Bluetooth 5.0/NFC

  The same as Seeed Studio XIAO nRF52840

  On-chip Memory

  1 MB flash and 256 kB RAM

  The same as Seeed Studio XIAO nRF52840

  Onboard Memory

  2 MB QSPI flash

  The same as Seeed Studio XIAO nRF52840


  1xUART, 1xIIC, 1xSPI, 1xNFC, 1xSWD,

  The same as Seeed Studio XIAO nRF52840

  11xGPIO(PWM), 6xADC



  Onboard PDM digital microphone

  Onboard 6-axis IMU


  21 x 17.5mm

  The same as Seeed Studio XIAO nRF52840


  Circuit operating voltage: 3.3V@200mA

  The same as Seeed Studio XIAO nRF52840

  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



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 Studio XIAO nRF52840 x1

Check five pieces of 7-pin male header compatible for Seeed Studio XIAO Series Board!





Does the XIAO microcontroller come with a pin header?

Currently, all XIAOs don't come with a pin header. You can purchase them through Also add or pin header.

Does the XIAO nRF52840 support Zigbee?

Unfortunately, the XIAO nRF52840 doesn't support Zigbee


HSCODE 8517180050
USHSCODE 8543708800
EUHSCODE 8543709099
CE 1
EU DoC 1
RoHS 1
UK DoC 1



Write Your Own Review
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  1. Product Quality
    from order view
    Very interesting product!
  2. Product Quality
    from order view
    Love these for making small, powerful, Bluetooth enabled projects. These are for wireless split keyboard this time.
  3. Product Quality
    from order view
    I got these cute XIAO series microcontrollers. Very well packed.
    Tested all the development boards. all works. Seeed Wiki is a good place to get started.
  4. Product Quality
    from order view
    Amazingly small! Quality is superb, I wish they make an esp32cam this size =)
  5. Product Quality
    from order view
    Overall I'm very content and impressed. So first my compliments.
    What I do wish to accomplish sending detected potentio values in an simple array using Bluetooth or Wifi to another nRF52840 (sense) with servo's.
    So found the client/server examples, but I do think they are complicated. Overcomplicated?


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