The Physics of the Blue LED (and the Nobel Prize Awarded for its Achievement)
Sixty Symbols explain the physics behind how the blue LED came into being – every time I see a high-brightness blue LED I give a momentary thought to how incredible it is that blue LEDs have only been a thing in our world for ~24 years (they’re so young!).
(For much longer viewing you can watch Shuji Nakamura give a 20+ minute presentation on Light for a Better World: A Celebration of U.S. Innovation – available here.)
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, or even use Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for MakeCode, CircuitPython, 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.