#Arduino external power supply series

The ground provides a reference of sorts and helps keep the signals confined to the return path (ground) and prevent them from interfering with each other. You certainly dont want them interfering with other signals that may be critical to a working circuit. That same stands for other signals, they have to go somewhere. In short they are specially tailored interference signals They are in fact referenced to a 'ground plane' otherwise they would not get very far at all and probably just interfere with other radio signals. Without a ground it cannot really go anywhere as it needs a 'return path'īut you may say 'what about radio waves they just go into the atmosphere'

#Arduino external power supply series

That signal can be a series of on/off pulses. Other aspects to be considered but not dealt with here are :-Īnd a few more but for the purposes of keeping it simple I only added the above to compliment Perry's post.Īlso my thanks to Robin and Perry for the insights and might not explain this too well so forgive me if I am a little off base. Better to avoid ground loops that can be a source of interference into your ground or transmission of your signals to other parts of the circuit.Try to avoid introducing inductance with coiled wires or similar although twisted pairs are a basic loop.Any grounds that present high frequency signals should not be shared with other more sensitive grounds.Long wires can pick up noise and should be kept as short as possible or shielded.The current return paths must also be kept short (aka ground).

Try to keep ground and signal leads as short as you can.Electrically there can be multiple differences in the way both schemes work even though it may on the surface look like the grounds are all just connected to each other.