Attached is a suggestion for filtering inputs and outputs from noise spikes.
It requires some soldering and as many capacitors as there are inputs and outputs.
There have been numerous posts of project issues that can be traced back to noise issues so I have been thinking of a relatively simple way to incorporate effective filtering without a bunch of parts.
This approach DOES NOT PROTECT FROM OVERVOLTAGE (i.e. 5V into a 3.3V pin)
However it think it makes for a neat package and easy isolation of signal wires.
Caution when attaching the Arduino board to the copper board, be sure non of the connections on the arduino board touch the copper. I would suggest protecting the bottom of the connectors with a strip of cardboard (like on the back of a paper pad) Taped to the copper.