🌴 Outdoor BLE-connected UV sensor keychain 🗝

power LiPO
wireless BLE
sensor UV Index
mcu nRF52
battery life 5 days
bom items 13
bom cost USD $50.47
vendors 4
completed July 2019


Prototype Front
Prototype Back
Prototype Side
Prototype Top

Getting Started

Step 2

Flash the firmware onto the nRF52 board to display UV Index and battery level.

Serial console for firmware


  • Flashing firmware: Plug in the USB cable into the USB connector
  • Charging the LiPo: Plug in the USB cable into the USB connector. Charging will have the yellow LED on.