Seeed Studio · nRF52
Seeed XIAO nRF52840
Probably the best tiny board for coin-cell-class battery life: nRF52840 with BLE 5, a LiPo charger and a deep sleep in the single-digit µA range.
BLEThread/Zigbee3.3 V logicTiny
Typical price
$9.90
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Specifications
| Maker | Seeed Studio |
|---|---|
| Chip | nRF52840 |
| CPU | Arm Cortex-M4F |
| Clock speed | 64 MHz |
| Wi-Fi | None |
| Bluetooth | Bluetooth 5 (LE) |
| Zigbee / Thread radio | Yes (802.15.4) |
| GPIO pins | 11 usable |
| ADC | 6 channels, 12-bit |
| DAC | None |
| Flash | 1 MB |
| RAM | 256 KB |
| Logic level | 3.3 V |
| Power input | 5V USB-C / LiPo |
| Deep sleep (typ.) | ~5 µA |
| Active current (typ.) | ~12 mA |
| Form factor | Tiny |
| USB | USB-C (native) |
| Programming | Arduino, CircuitPython, Zephyr |
| Released | 2022 |
Typical values. Sleep current is approximate; whole-board numbers are higher than the bare chip's datasheet figure.
Pros
- Among the lowest sleep currents of any hobby board
- BLE 5 with LiPo charging
- Sense variant adds IMU and microphone
Cons
- No Wi-Fi
- Smaller community than ESP32 for Arduino
- Few exposed pins
Best use cases
- 01BLE sensors that run for months
- 02Trackers and tags
- 03Wearables
- 04Low-power HID devices
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