Sometimes you need to know which wire/node is positive polarity and which wire/node is negative polarity.The LED as a polarity indicator circuit is show in above diagram. In the diagram as you can see ...

In this article I will add some simple Arduino LED projects starting with basic ones like how to turn on an LED, blinking, and more. Every step will have the code, the schematic, photos of the project ...

Creating illuminated play dough sculptures is easy once you know the basics of circuit building. Master these simple circuits and you'll be ready to create a glowing play dough masterpiece. But ...