The image shown below indicates the basic wiring diagram of the current limiting resistors and driver transistors. Next is the Hookup diagram of the Arduino 4-Digit 7-segment LED Display, followed by ...

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. In my example the whole ...

Instead he had to run the signals through a set of PNP transistors to ... with counter IC’s. The Arduino can just increment the counter up to the appropriate LED. The Arduino then controls ...

The 5mm Blue LED’s are positioned 30mm apart ... image below – bottom right – shown passing through NPN transistors). The Arduino Mega 2560 R3 is positioned on a suspended platform, with ...