Working from a diagram helps when you're building something, but what if you don't have one? No problem, create your own. I have just had a go with Cadsoft Eagle and produced a schematic for driving a motor from an Arduino board. I don't think my design standards are too good, but it does the job. There wasn't a schematic for a motor in the library, but since the software is aimed at creating a board and motors are not usually soldered to a PCB that probably makes sense.
If you're thinking of using this schematic, and you are free to do so, then I suggest you wait until I've built it and tested it. The next stage is to write the software.
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