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      Seeed XIAO BLE nRF52840 Sense - TinyML/TensorFlow Lite- IMU / Microphone - Bluetooth5 (SE-102010469)

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      Seeed XIAO BLE nRF52840 Sense - TinyML/TensorFlow Lite- IMU / Microphone - Bluetooth5 (SE-102010469)

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      Seeed XIAO BLE nRF52840 Sense - TinyML/TensorFlow Lite- IMU / Microphone - Bluetooth5 (SE-102010469)


      • 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 Bluetooth 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 microphone
      • Onboard 6-axis IMU
      • Single-sided components, surface mounting design
      • Corresponded to TinyML AI project: Sensing, Processing, Communication 3 in 1 Node


      As the advanced version of the board XIAO BLE, Seeed XIAO BLE Sense 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 capabilities 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. 


      In addition, it carries two extra onboard sensors. One of them is a digital microphone created through Pulse Density Modulation(PDM) module on the nRF52840 chip. It can receive audio data in real-time which allows it can be used for audio recognition. The board not only receives audio data but also can speak through the MSM261D3526H1CPM microphone. The other one is 6-axis Inertial Measurement Unit(IMU) which can be applied in TinyML projects like gesture recognition. These onboard sensors provide a great convenience for users and the ultra-small size feature of the board has still remained. 


      Same as XIAO BLE, Seeed XIAO BLE Sense contains a wealthy 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. 

      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: 3.3V@200mA

        The same as XIAO BLE

        Charging current: 50mA/100mA

        Input voltage (VIN): 5V

        Standby power consumption:  <5μA

      XIAO BLE Sense is compatible to the XIAO expansion board.


      • Wearable devices
      • Wireless connect
      • Embedded machine learning projects
      • IoT and TinyML AI application
      • Perfect for mini Arduino projects

      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 M0+@48MHz RP2040 Dual-core M0+@133Mhz nRF52840 M4F@64MHz nRF52840 M4F@64MHz
      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.

      Seeed Studio

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