Robot Building for Beginners, Third Edition

CHAPTER 12 ■ SOLDERLESS PROTOTYPING

25-Position Distribution Bus

At this point, you’ve probably got the board figured out. Everything is in groups of five. Well, what’s the deal
with the two leftover rows running the length of the top and bottom?
The two horizontal rows of holes at the top and bottom of the breadboard are called distribution
buses (see Figure 12-9). Although they appear to be horizontal groups of five, they are actually connected
underneath to a metal strip that is much longer, 25 holes.

Figure 12-8. Improperly placed DIP with pins in the gap

Figure 12-9. Two wires connected on a distribution bus