Assembling small Arduino extension circuits is normally a matter of plugging parts into a breadboard and making connections using a bunch of colored jumper cables. However, all this plugging and figuring out often takes more time than writing the program. Also, the component arrangement for, say, a running light with a 11 LEDs and as many series resistors is subject to errors and precious hours spent on hardware debugging! In such cases, a dedicated training board, such as like Elektor’s new “MCCAB,” is more advantageous, especially as it comes with a great instruction book.