← All parts
Bluetooth Restroom Key Proximity Tracker
AdafruitnRF52840
A Bluetooth proximity tracker for key fobs using Adafruit Feather nRF52840 Express board.
In stock
Specifications
4- Operating Voltage
- 3.7V (LiPo battery) to 5V (USB power) V
- Flash
- Not explicitly stated, but likely less than 256KB KB
- Ram
- Not explicitly stated, but likely less than 32KB KB
- Gpio Count
- 21
Pinout
5Low source legibility.The original manufacturer datasheet for this part was difficult to read, so this pinout may be incomplete or imperfect. Always confirm against the specific manufacturer’s datasheet before wiring.
| Pin | Name | Functions | Notes |
|---|---|---|---|
| BATTERY | Battery ADC | ADC | Battery voltage measurement |
| D5 | Reed Switch | GPIO | Magnetic field detection for key fob docking |
| D6 | Amp Enable | PWM | Controls I2S amplifier enable pin |
| D9 | I2S TX/RX | SPI | I2S interface for audio output |
| NEOPIXEL | NeoPixel RGB LED | GPIO | Built-in RGB LED for status indication |
Interactive pinout
Highlight:
nRF52840
Click a pin to copy its name · tap a tag above to spotlight a bus.