Seeed Studio
Seeed XIAO nRF52840 Build something that runs for a long time on a small battery and talks over Bluetooth.
Build & code nRF52840 Bluetooth LE Low power
Bring along USB-C cable, a lithium cell if you want it portable, and Arduino, MicroPython or CircuitPython.
Keep in mind No Wi-Fi at all, and the base board has no IMU or microphone — that is the Sense variant. Source checked · Sep 18, 2026 Image credit Maker image · XIAO nRF52840, front · Seeed Studio CC BY-SA 4.0 · Re-encoded as JPEG for display; content unchanged. A copy with the background removed is shown in the catalogue. Original image
Overview Blueprint 4 Specifications 17 Resources 5
(02) Blueprint
Build it yourself 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).
Research 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.
Every link checked 2026-09-27.
Hand this device to your agent. Everything on this page, as clean Markdown and JSON: specs, shops, prices, design files, parts.
Made the Seeed XIAO nRF52840? Put the badge on your README; it links here, with every shop that sells it.
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Processor & memory 4 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 3 Bluetooth The comparison table states Bluetooth LE 5.4 with Bluetooth mesh; the feature list on the same page states Bluetooth 5.0 Interfaces & power 7 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 3 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 No matching specification. Try a chip name, connector or feature.
What still needs checking The maker publishes no battery runtime for the board, only a standby current figure. No transmit power or range figure is given for the Bluetooth radio on the product wiki.
Downloads & docs
Source & revision notes Maker listing checked Sep 18, 2026. Detailed documentation reviewed Sep 18, 2026. Not hands-on tested.
Price is a dated listing; confirm with the maker.
The maker's own page disagrees with itself on the Bluetooth version: the feature list says Bluetooth 5.0 while the comparison table on the same page says Bluetooth LE 5.4. We have not resolved which is correct and neither should you assume.
This entry covers the base XIAO nRF52840. The Sense variant adds a six-axis LSM6DS3TR-C IMU and a PDM microphone, and the Plus variants change the pin count — do not apply their specifications here.
The sub-5 µA standby figure is the maker's typical value for the bare board, not for a build with peripherals attached.
The Bluetooth version is stated two different ways on one page (5.0 in the features, 5.4 in the table). We record both rather than pick one.
Most figures on this page are presented as a four-way comparison across nRF52840, Sense, Plus and Sense Plus. Confirm the column before quoting.
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