Corresponded to TinyML AI project: Sensing, Processing, Communication 3 in 1 Node
Description
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 and XIAO Expansion board. 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, 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.
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
Attention:
All the I/O pins are 3.3V, please do not input more than 3.3V, otherwise, the CPU may be damaged.
