🌟 The Seeed Studio XIAO nRF52840 Sense is a thumb-sized, ultra-low-power development board designed for Bluetooth 5.0 and embedded machine learning applications. Powered by the Nordic nRF52840 SoC, it combines wireless connectivity, onboard sensors, and flexible programming support in a compact 21 × 17.5 mm form factor.
🧠 With built-in 6-axis IMU and PDM digital microphone, it’s ideal for voice recognition, motion tracking, and TinyML projects. Whether you're building a wearable device, smart sensor, or AI-powered IoT node, the XIAO nRF52840 Sense delivers reliable performance, low power consumption, and seamless integration with Arduino and CircuitPython ecosystems.
✨ Feature Highlights
- 🧠 Versatile Microcontroller: Nordic nRF52840 chip with FPU, up to 64 MHz, supports Arduino and CircuitPython
- 📡 Wireless Capabilities: Bluetooth 5.0, BLE, onboard antenna, and NFC connectivity
- 🔋 Power Efficiency: Ultra-low power consumption (5 μA in deep sleep), with lithium battery charging support
- 🎙️ Onboard Sensors: Integrated PDM microphone and 6-axis IMU for embedded AI applications
- 📏 Compact Design: 21 × 17.5 mm footprint, perfect for wearables and space-constrained projects
📐 Specifications
| Item | Seeed Studio XIAO nRF52840 | Seeed Studio XIAO nRF52840 Sense |
| 🧠 Processor | Nordic nRF52840 — ARM® Cortex®-M4 with FPU, up to 64 MHz | |
| 📡 Wireless | Bluetooth 5.0 + NFC connectivity | |
| 💾 On-chip Memory | 1MB Flash + 256KB RAM | |
| 💾 Onboard Memory | 2MB QSPI Flash | |
| 🔌 Interfaces | UART, I2C, SPI, NFC, SWD, 11×GPIO (PWM), 6×ADC | |
| 🎙️ Sensors | / | PDM digital microphone + 6-axis IMU |
| 📏 Dimensions | 21 × 17.8 mm | |
| 🔋 Power | Circuit voltage: 3.3V @ 200mA Charging current: 50mA / 100mA Input voltage (VIN): 5V Standby consumption: <5μA | |
🧩 Hardware Overview
📌 Pinout
🎯 Applications
- ⌚ Compact and flexible wearable devices
- 📡 Wireless connectivity projects using Wi-Fi/Bluetooth
- 🧠 Embedded machine learning and TinyML
- 🌐 IoT edge nodes and AI-powered sensors
- 🔧 Ideal for mini Arduino and CircuitPython projects
📄 Documents
- 📘 BQ25101 Datasheet
- 📘 ST LSM6DS3TR Datasheet
- 🎙️ MSM261D3526H1CPM Microphone Datasheet
- 🧠 Nano BLE MCU nRF52840 PS v1.1
- 📐 Bottom Pad Positioning
- 💾 Flash P25Q16H-UXH-IR Datasheet
- 📶 BLE Communication Distance Test Report
- ✅ CE | FCC | MIC Certification
- 🧠 TinyML Case Studies
- 📐 XIAO Reference Design
- 🖨️ 3D Printing Case Studies
📦 Part List
| Seeed Studio XIAO nRF52840 Sense – nRF52840 | x1 |
| 7-Pin Header | x2 |
📘 Related Article
Seeed XIAO nRF52840 Sense vs Standard: Which Is Right for You?