Does signal ground have to be connected to actual ground, or does it simply need to be a common node? I have a number of "floating grounds" in my schematic (denoted by the upside-down triangle) and also actual grounds (on Arduino; denoted by lines slanted to the left). I assume they are distinct, and I'm guessing I have to connect all of the signal grounds together but I don't know if they need to also be connected to "earth" ground.
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