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 ...

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 ...

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 ...

This part number (and ofcourse the LED type) is not very critical. If you want to use a bi-polar transistor, don’t forget to add a resistor (~1KΩ ) between Arduino D10 and the base terminal of the ...