# Seeed XIAO nRF52840 (Seeed Studio)

> Low-power Bluetooth board on the nRF52840, the chip most battery-powered mesh nodes use.

- **Category:** Boards & controllers
- **Availability:** Listed by maker
- **Price:** US$9.99 (at seeedstudio.com), checked 2026-09-18
- **Good for:** Build something that runs for a long time on a small battery and talks over Bluetooth.
- **You'll need:** USB-C cable, a lithium cell if you want it portable, and Arduino, MicroPython or CircuitPython.
- **Trade-off:** No Wi-Fi at all, and the base board has no IMU or microphone — that is the Sense variant.
- **Page:** https://gadgets.sh/devices/seeed-xiao-nrf52840/

## Where to buy

| Shop | Status | Link |
|---|---|---|
| Seeed Studio | Orderable | https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=seeed-xiao-nrf52840&utm_content=api |
| The Pi Hut | Orderable | https://thepihut.com/products/seeed-xiao-ble-nrf52840?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=seeed-xiao-nrf52840&utm_content=api |
| DigiKey | Orderable | https://www.digikey.com/en/products/detail/seeed-technology-co-ltd/102010448/16652893?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=seeed-xiao-nrf52840&utm_content=api |
| Seeed Studio | Documentation at wiki.seeedstudio.com | https://wiki.seeedstudio.com/XIAO_BLE/?utm_source=gadgets.sh&utm_medium=referral&utm_campaign=seeed-xiao-nrf52840&utm_content=api |

## Blueprint

**Open hardware.** Seeed publishes the full KiCad project, schematic PDF, pinout sheet and 3D/mechanical files for the base XIAO nRF52840 directly on its wiki file server (no GitHub hardware repo).

### Design files

- schematic: [Schematic (PDF)](https://files.seeedstudio.com/wiki/XIAO-BLE/Res/260828_XIAO_nRF52840.pdf) (PDF)
- pcb: [KiCad project v1.2 (zip)](https://files.seeedstudio.com/wiki/XIAO-BLE/Res/260828_Seeed_Studio_XIAO_nRF52840_v1.2.zip) (ZIP)
- pinout: [Pinout sheet (XLSX)](https://files.seeedstudio.com/wiki/XIAO-BLE/XIAO-nRF52840-pinout_sheet.xlsx) (XLSX)
- 3d-model: [3D model (STEP, zip)](https://files.seeedstudio.com/wiki/XIAO-BLE/seeed-studio-xiao-nrf52840-3d-model.zip) (ZIP)

### Key parts

| Part | Role | Datasheet |
|---|---|---|
| Nordic nRF52840 | MCU/BLE radio | https://files.seeedstudio.com/wiki/XIAO-BLE/nRF52840_PS_v1.5.pdf |
| TI BQ25101 | Li-po charger | https://www.ti.com/product/BQ25101 |

_Notes:_ All files.seeedstudio.com URLs curl-verified 200. Entry covers the base XIAO nRF52840 (non-Sense, non-Plus) v1.2 hardware; the wiki page also hosts separate schematic/KiCad packages for the Sense and Plus variants which are not the same PCB.

## Specifications

### Processor & memory

| | |
|---|---|
| Processor | Nordic nRF52840, ARM Cortex-M4 with floating point, 64 MHz |
| Memory | 256 KB RAM and 1 MB flash in the chip, plus 2 MB flash on the board |
| Dimensions | 21 × 17.8 mm, the XIAO series form factor |
| Construction | Single-sided components, designed for surface mounting |

### Radio

| | |
|---|---|
| Bluetooth | The comparison table states Bluetooth LE 5.4 with Bluetooth mesh; the feature list on the same page states Bluetooth 5.0 |
| NFC | One NFC interface |
| Antenna | On-board antenna |

### Interfaces & power

| | |
|---|---|
| Buses | 1× UART, 1× I²C, 1× SPI, 1× NFC, 1× SWD on the base board |
| Pins | 11 PWM-capable GPIO and 6 ADC on the base board |
| Charging | BQ25101 charge chip handling lithium charge and discharge |
| Standby | Maker states standby consumption under 5 µA |
| Controls | Reset button; a three-in-one LED and a charge LED |
| Languages | Arduino, MicroPython and CircuitPython are all documented |
| Price checked | US$9.99 at the maker's store |

### Variants

| | |
|---|---|
| Sense | Adds a six-axis LSM6DS3TR-C IMU and a PDM microphone; the base board has neither |
| Plus | Changes the interface count to 2× UART, 2× SPI, 1× I²S and 18 PWM-capable GPIO |
| Headers | Pins are not included with the board |

## Documentation

- [Maker specifications and documentation](https://wiki.seeedstudio.com/XIAO_BLE/)
- [Seeed Studio store listing](https://www.seeedstudio.com/Seeed-XIAO-BLE-nRF52840-p-5201.html)
- [Nordic nRF52840 product specification v1.5](https://files.seeedstudio.com/wiki/XIAO-BLE/nRF52840_PS_v1.5.pdf)
- [XIAO nRF52840 schematic](https://files.seeedstudio.com/wiki/XIAO-BLE/Res/260828_XIAO_nRF52840.pdf)
- [BQ25101 charger datasheet](https://files.seeedstudio.com/wiki/XIAO-BLE/BQ25101.pdf)

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Source: gadgets.sh · https://gadgets.sh/devices/seeed-xiao-nrf52840/ · JSON: https://gadgets.sh/api/v1/devices/seeed-xiao-nrf52840.json