Adafruit · nRF52
Adafruit Feather nRF52840 Express
A polished BLE board with a LiPo charger, UF2 bootloader and excellent CircuitPython support — a long-time favourite for wireless wearables.
BLEThread/Zigbee3.3 V logicFeather
Typical price
$24.95
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Specifications
| Maker | Adafruit |
|---|---|
| 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 | 21 usable |
| ADC | 6 channels, 12-bit |
| DAC | None |
| Flash | 1 MB |
| RAM | 256 KB |
| Logic level | 3.3 V |
| Power input | 3.5–6V / LiPo / USB |
| Deep sleep (typ.) | ~40 µA |
| Active current (typ.) | ~15 mA |
| Form factor | Feather |
| USB | USB-C (native, UF2 bootloader) |
| Programming | CircuitPython, Arduino, Zephyr |
| Released | 2019 |
Typical values. Sleep current is approximate; whole-board numbers are higher than the bare chip's datasheet figure.
Pros
- Excellent BLE stack and UF2 drag-and-drop updating
- LiPo charger and Feather accessories
- Very low power in sleep
Cons
- No Wi-Fi
- Pricey vs generic nRF52840 boards
- Smaller RAM than ESP32 boards
Best use cases
- 01BLE sensors and wearables
- 02Battery-powered trackers
- 03CircuitPython + Bluefruit apps
- 04Keyboards and HID gadgets
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