1 sweater (preferably light-colored and a size bigger than you usually wear) 1 string of 50 addressable RGB LED lights; 1 Arduino; 1 micro-USB cable; 1 9-volt battery holder with a switch; 1 9 ...

When you read “Arduino wristwatch”, you fall into the trap of envisioning an Arduino UNO clumsily strapped to someone’s wrist. [Marijo Blažević’s] creation is much more poli… ...

It is a pretty common first project to use an Arduino (or similar) to blink an LED. Which, of course, brings taunts of: you could have used a 555! You can, of course, also use any sort of oscillato… ...