Timeline for Can or should I tie wall brick ground to battery ground?
Current License: CC BY-SA 4.0
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| Dec 31, 2023 at 18:03 | comment | added | kbyrd | I finally got around to re-assembling this yesterday and testing this morning. Of course, you're right. When the USB cable is plugged into the Pi, I have continuity between Pi GND and Arduino GND. In my head, I was imagining that if the Pi VCC was higher than the USB voltage from the Pi, the GND would not be tied. Now that I say that out loud, that seems silly. Thanks for your answer! | |
| Dec 31, 2023 at 18:01 | vote | accept | kbyrd | ||
| Dec 24, 2023 at 8:51 | comment | added | Justme | @kbyrd You say you have Sparkfun.Pro Micro. The schematics are freely available, so I read them. Also, never have I encountered any Arduino or Raspberry Pi on any similar board with isolated USB ground from the main system/power ground. So you can also safely assume they are the same ground on any board. | |
| Dec 23, 2023 at 21:58 | comment | added | kbyrd | Really? I'm pretty sure I didn't have continuity between RPi GND and Arduino GND when I had this setup, I assumed this was because of the diode (I may have the diode in the wrong place, maybe it's on the USB GND line? I have this taken apart right now so I can't measure it. | |
| Dec 23, 2023 at 21:06 | history | answered | Justme | CC BY-SA 4.0 |