Here is a simple, yet useful circuit of an Arduino 4-digit 7-segment LED display unit. The module used here is ... D13 of the Arduino is reserved for the decimal point segment. The 10K potentiometer ...

This is an easy tutorial showing how you can control the brightness of an LED or adjust the speed of a DC fan using Arduino Board, a small BC547 transistor and a potentiometer ... Do not power the ...

but then all you have is an LED circuit. Learning to build a robot arm will teach you how to breadboard a circuit, how to program your Arduino, and how to work with moving parts. In the end ...