Here’s an LED indicator which was made at home out of a Silicon Carbide (SiC) crystal (Internet Archive Mirror). The concept is simple, but a bit of trial and error ...

Most modern Windows laptops and desktops with built-in webcams have dedicated LED indicators to let you know that the camera is powered on and watching you. However, some devices come with no such ...

The semiconductor light-emitting diode, or LED, is a key component of today's technology. Modern households have numerous tiny glowing indicators — provided by LEDs — that are used for reading ...

Pretty good info given that all he had to go on was a blinking light. Where else are there LED indicators which you can tap into? Here’s an only slightly more invasive usage where a washing ...