Seeed Studio XIAO BLE nRF52840

The Seeed Studio XIAO BLE nRF52840 is a tiny Bluetooth Low Energy development board based on the Nordic nRF52840. It features BLE 5.0, USB-C, and an onboard antenna in an incredibly small form factor for wearable and IoT projects.

Key Features

• Nordic nRF52840 ARM Cortex-M4 with FPU
• Bluetooth 5.0 / BLE / Mesh / NFC support
• USB Type-C connector
• Ultra-small size (21mm x 17.5mm)
• Onboard ceramic antenna for BLE
• battery for runtime monitoring
• Low power consumption for battery projects

Technical Specifications

Applications

• Wearable electronics and fitness trackers
• BLE sensor beacons
• Smart home devices
• Portable IoT endpoints
• Ultra-compact robotics
• BLE mesh networks

Important Notes

• Install Seeed nRF52 board support in Arduino IDE
• USB bootloader supports drag-and-drop programming
• Battery voltage divider on P0.31 – use analogRead for level
• Some GPIO reserved for NFC by default
• Tiny size requires fine-pitch soldering skills for custom connections