Seeed Studio XIAO nRF52840 Sense

The Seeed Studio XIAO nRF52840 Sense is a very small board (21 × 17.8 mm) with the Nordic nRF52840 (ARM Cortex-M4 with FPU, 64 MHz), Bluetooth LE and NFC. The Sense version also has a digital PDM microphone and an LSM6DS3TR-C 6-axis motion sensor (IMU). A 3.7 V LiPo battery can be connected to the solder pads on the back and is charged via USB-C with the BQ25101 charging chip. The board is programmed with Arduino, MicroPython or CircuitPython.

Recommended Accessories:

• Seeed Studio Expansion Base for XIAO
• Seeed Studio Grove Base for XIAO

Features:

• Nordic nRF52840, ARM Cortex-M4 with FPU, 64 MHz
• 256 KB RAM, 1 MB flash, plus 2 MB flash on the board
• Bluetooth LE with on-board antenna, NFC
• Digital PDM microphone
• LSM6DS3TR-C 6-axis motion sensor (IMU)
• 11 GPIO with PWM, 6 of them analogue inputs
• UART, I2C and SPI
• USB-C, BQ25101 charging chip with 50 or 100 mA
• RGB LED, charge indicator and reset button (press twice for the bootloader)
• Pinout as an image in the picture gallery

Application Examples:

• Bluetooth sensors and wearable devices
• Detecting movements and sounds with machine learning (TinyML)
• LoRa nodes with the Seeed Studio Wio-SX1262 Lora Base for XIAO
• Integration into Home Assistant with ESPHome

Documentation:

• XIAO nRF52840 (Sense) wiki (Seeed Studio)
• ESPHome documentation: NRF52 Platform

Technical Data:

• Manufacturer: Seeed Studio
• Manufacturer SKU: 102010469
• Chip: Nordic nRF52840
• CPU: ARM Cortex-M4 with FPU, 64 MHz
• RAM: 256 KB
• Flash: 1 MB, plus 2 MB on the board
• Radio: Bluetooth LE, NFC
• Sensors: IMU LSM6DS3TR-C, PDM microphone
• I/O: 11 GPIO with PWM, 6 analogue inputs
• Interfaces: UART, I2C, SPI
• Logic voltage: 3.3 V
• Charging chip: BQ25101
• Standby: below 5 µA
• Connector: USB-C
• Button: reset
• Dimensions: 21 × 17.8 mm
• Weight: 4 g

Scope of Delivery:

• 1× Seeed Studio XIAO nRF52840 Sense