You can’t really see without a video, but the display alternates between showing the current UV index and the total exposure since turning the hat on. When the exposure display fills all the pixels, I’ve reached the ‘barely perceptible 24 hours later sunburn’ level and it’s time to go inside. I plan to keep the hat on my desk at work for lunchtime excursions. I don’t normally wear sunscreen to work, so having the hat to keep track of my exposure is really practical.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.