When you read “Arduino wristwatch”, you fall into the trap of envisioning an Arduino UNO clumsily strapped to ... you get one of the LEDs to light to show the hours. Another press reads ...

You can fade out and fade in the light of an LED automatically by using Arduino and a simple code that is described below. Even though the Arduino board cannot output variable voltage on its digital ...

It works like you’d probably expect — the light moves back and forth between the two players. Keep it in the green and you have a nice, gentle volley going. Let it hit your red LED and you ...