- 1 x 5mm Blue LED Light Emitting Diode
5mm Blue LED Light Emitting Diode, bright and blinky, soft and elegant. 5mm Blue LED Lights Emitting Diode is festive! They're colourful! They're everywhere and they're a lot of fun. We love LEDs when we write tutorials because most of electronics hackery is hidden in chips or goes very fast and we can't see or sense it without expensive equipment. But LEDs are easy to see for everyone - this way we can visually identify what is going on inside our microcontroller.