[Chuck] recently did a video about a new Tinkercad feature: building and simulating virtual Arduino circuits. You can watch it below. There are a variety of components you can add to your design.

Do this before you sew anything onto your sweater just to make sure the LED string will correctly fit the pattern you drew. Start with the end of the string so the Arduino ends up at the bottom of ...

Let it hit your red LED and you’ve lost a point ... Inside the cool laser-cut box is an Arduino Uno and a 9V battery, plus a current-limiting resistor and the all-important buzzer.