We’d seen it done with buttons, switches, gestures, capacitive touch, and IR remote ... (which are the “D” in LED) to use the LED itself as a temperature sensor. A diode’s voltage ...

Although it’s an amazing DIY project, we noted that most of the readers are looking for more advanced circuits using multiple seven-segment light emitting diode displays. Here is a simple, yet useful ...

[Sebastian] is learning Morse code ... by using a touch sensor. An ATtiny45 measures the time it takes for a single metal plate to fully charge. It’s the same idea behind the wonderful Arduino ...