🌴 Get alerted on excessive UV radiation with a backpack keychain 🗝

power LiPO
wireless BLE
sensor UV Index
mcu nRF52
ota? No
battery life 5 days
bom items 13
bom cost USD $50.47
vendors 4
status completed in 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.