Getting Started with XIAO nRF52840Sense
As the advanced version of the board XIAO nRF52840, XIAO nRF52840
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 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 nRF52840, XIAO nRF52840 Sense contains a wealthy
interface. The first thing to note is that the Near Field Communication(NFC) is
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