Seeed Studio XIAO nRF52840 Sense is a diminutive development board, part of the XIAO series, which represents a perfect blend of "Tiny" and "Puissant". This tiny board, measuring only 21 x 17.5mm, is packed with features that make it an ideal tool for embedded Machine Learning projects. It carries Bluetooth 5.0 wireless capability and operates with low power consumption, making it suitable for wearable devices and Internet of Things projects.

The XIAO nRF52840 Sense features a Nordic nRF52840 chip with FPU, operating up to 64 MHz, and supports multiple development ports, including Arduino and CircuitPython. It also includes onboard IMU and PDM, allowing for advanced sensor capabilities. With its ultra-low power consumption of only 5 μA in deep sleep mode, this board is perfect for applications that require low power usage.

The board's advanced power design provides lithium battery charge management, and it supports USB Type-C interface for power supply and code downloading. It also features rich on-chip memory, including 1 MB flash and 256 kB RAM, as well as 2 MB QSPI flash. The 11 digital I/O and 6 analog I/O make it versatile for various applications.

The following are the key specifications of the Seeed Studio XIAO nRF52840 Sense:

• Processor: Nordic nRF52840, ARM Cortex-M4 with FPU, up to 64 MHz


• Wireless: Bluetooth 5.0, NFC


• On-chip Memory: 1 MB flash, 256 kB RAM


• Onboard Memory: 2 MB QSPI flash


• Interface: 1xUART, 1xIIC, 1xSPI, 1xNFC, 1xSWD, 11xGPIO(PWM), 6xADC


• Sensors: Onboard PDM digital microphone, Onboard 6-axis IMU


• Dimensions: 21 x 17.5mm


• Power: Circuit operating voltage: 3.3V@200mA, Charging current: 50mA/100mA, Input voltage (VIN): 5V, Standby power consumption: <5 μA

The Seeed Studio XIAO nRF52840 Sense is suitable for a wide range of applications, including:

• Small and flexible wearable devices


• Wifi/Bluetooth controlled wireless connection projects


• Embedded Machine Learning projects


• IoT and TinyML AI applications


• Mini Arduino projects

Important Note: All I/O pins are 3.3V, please do not input more than 3.3V, otherwise, the CPU may be damaged.