Did you know that you can use Arduino to turn on an LED when you press a button? Well, it is true, you can do this! Leaving the joke aside, let me show how you can achieve this. You will need the ...

I can set my LEDs to the exact brightness level I like on a 0-100% scale typically with a little button or knob. Look a little closer at the way LEDs in such projects dim, and you will find that in ...

But there are really just the two speeds with the current programming. Inside the cool laser-cut box is an Arduino Uno and a 9V battery, plus a current-limiting resistor and the all-important buzzer.

Start with the end of the string so the Arduino ends up at the bottom of the sweater. This will give you easy access to the battery pack and the on-off switch once the project is finished. 9.

The latest Switch firmware update finally provides a use for that LED ring around the Home Button.