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# Seeed XIAO BLE nRF52840 Sense - IMU / Microphone - Bluetooth5

**Type:** Product page · **SKU:** SS102010469 · **Brand:** [Seeed Studio](https://core-electronics.com.au/brands/seeed-studio-australia)
**Page:** https://core-electronics.com.au/seeed-xiao-ble-nrf52840-sense-tinyml-tensorflow-lite-imu-microphone-bluetooth5.html ([markdown](https://core-electronics.com.au/seeed-xiao-ble-nrf52840-sense-tinyml-tensorflow-lite-imu-microphone-bluetooth5.html.md))

Seeed XIAO BLE Sense is a development board that has equipped a powerful Nordic nRF52840 chip with FPU operating at 64MHz. It connects with Bluetooth and...

## Pricing

- **Price:** $29.45 (inc GST) — $26.77 AUD, exc GST
- **Quantity discounts:** 10+ $25.70 (exc GST) · 25+ $24.90 (exc GST)

## Availability & dispatch

- In stock, ships same business day if ordered before 2PM (Australia/Sydney).
- We can dispatch 59 today, and up to 50 more in 8–10 days.

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## Description

**Features**- Powerful CPU: [Nordic nRF52840](https://core-electronics.com.au/attachments/localcontent/Nano_BLE_MCU-nRF52840_PS_v1_18277b5ca8d.pdf), 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](https://core-electronics.com.au/attachments/localcontent/BQ25101_15893b60642.pdf) 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](https://core-electronics.com.au/attachments/localcontent/mic-MSM261D3526H1CPM-ENG_159169e047e.pdf)
- Onboard [6-axis IMU](https://core-electronics.com.au/attachments/localcontent/ST_LSM6DS3TR_Datasheet_183965fe666.pdf)
- 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.

As XIAO form factor, XIAO BLE Sense supports both [Grove Shield for XIAO](https://core-electronics.com.au/grove-shield-for-seeeduino-xiao-with-embedded-battery-management-chip.html) and [XIAO Expansion board](https://core-electronics.com.au/seeeduino-xiao-expansion-board.html). There is a slight difference between the pins and refer to the Pinout it is easy to manage. If you are interested in programming embedded machine learning, Seeed studio have a [Codecraft](https://ide.tinkergen.com/) graphic programming interface that can help you quickly start your own TinyML project.

**Specification**

 | Item | Seeed XIAO BLE - nRF52840 | Seeed XIAO BLE Sense - nRF52840 |
|---|---|---|
| Processor | Nordic nRF52840 | The same as XIAO BLE |
| ARM® Cortex®-M4 with FPU run up to 64 MHz |
| Wireless | 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 |
| Interface | 1xUART, 1xIIC, 1xSPI, 1xNFC, 1xSWD, | The same as XIAO BLE |
| 11xGPIO(PWM), 6xADC |
| Sensors |  | Onboard PDM digital microphone |
| Onboard 6-axis IMU |
| Dimensions | 21 x 17.5mm | The same as XIAO BLE |
| Power | Circuit operating voltage: 3.3V@200mA | The same as XIAO BLE |
| Charging current: 50mA/100mA |
| Input voltage (VIN): 5V |
| Standby power consumption: <5µA |

**Application**

- Wearable devices
- Wireless connect
- Embedded machine learning projects
- IoT and TinyML AI application
- Perfect for mini Arduino projects
 
**Hardware Pinout**

[![](https://core-electronics.com.au/attachments/localcontent/pinout2_201766bbb39.png)](https://core-electronics.com.au/attachments/localcontent/pinout2_201766bbb39.png)

[![](https://core-electronics.com.au/attachments/localcontent/functional2b_7386859aa9f.jpg)](https://core-electronics.com.au/attachments/localcontent/functional2b_7386859aa9f.jpg)

[![](https://core-electronics.com.au/attachments/localcontent/beibupinout3_85024db6921.png)](https://core-electronics.com.au/attachments/localcontent/beibupinout3_85024db6921.png)

**Seeed XIAO series**

![](https://core-electronics.com.au/attachments/localcontent/comparetu1_39016f82c70.png)

**Attention:**

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 Sense - nRF52840 | x1 |
|---|---|
| 7 Pins Header | x2 |

#### Documentations

- [BQ25101 Datasheet](https://core-electronics.com.au/attachments/localcontent/BQ25101_15893b60642.pdf)
- [ST LSM6DS3TR Datasheet](https://core-electronics.com.au/attachments/localcontent/ST_LSM6DS3TR_Datasheet_183965fe666.pdf)
- [mic-MSM261D3526H1CPM](https://core-electronics.com.au/attachments/localcontent/mic-MSM261D3526H1CPM-ENG_159169e047e.pdf)
- [Nano BLE MCU-nRF52840 PS v1.1](https://core-electronics.com.au/attachments/localcontent/Nano_BLE_MCU-nRF52840_PS_v1_18277b5ca8d.pdf)
- [Bottom-pad-positioning](https://core-electronics.com.au/attachments/localcontent/Bottom-pad-positioning_587105d42ac.zip)
- [Seeed XIAO nRF52840 v1.0 SCH](https://core-electronics.com.au/attachments/localcontent/Seeed-XIAO-nRF52840-v1_15238258af2.zip)
- [Flash\_P25Q16H-UXH-IR\_Datasheet](https://core-electronics.com.au/attachments/localcontent/Flash_P25Q16H-UXH-IR_Datasheet_312600df8af.pdf)
- [Seeed XIAO BLE nRF52840 BLE Communication Distance Test Report](https://core-electronics.com.au/attachments/localcontent/Seeed_XIAO_BLE_nRF52840_BLE_Communication_Distance_Test_Report_15037236111.pdf)
- [Xiao BLE nRF52840 Sense Wiki](https://wiki.seeedstudio.com/XIAO_BLE/#getting-started)

## Images

- [Product image 1](https://core-electronics.com.au/media/catalog/product/i/m/image_13548.jpg)