The question: How can I make the power for this example project come from
a single power source in terms of wiring? Most final projects I would think just plug into one wall outlet. What would the wiring connections look like?
Right now the arduino gets its 5V from USB and the motor sets its
supply elsewhere and has the decoupler 100uF so thats power coming from 2 places. This specific model of motor and driver in the picture is only an example so I can understand conceptually what I would need to do. This question keeps coming up for me. Thank you. I "uploaded" a pic.
You see two GND connectors on the motor driver board. One is the power minus pole and the other is the logic ground. This way the motor current does not run over logic wires and can not inject spikes or offset.
If you want to use a single power supply then connect it to the driver board and only the plus pole also to the barrel connector. Then use the Arduino GND as logic ground for connection of further modules.
To use a single source start off with the highest voltage you need, and then use buck converter regulators to drop the voltage down to the level you require from all the other components of your system.
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