Electronic – When a battery is your power source, what is ground

batteriesgroundpower supply

For the sake of not incorrectly connecting my power supply and damaging my board I'm going to ask a relatively dumb question. Is ground on my board the negative terminal on my battery? Explicitly should I connect the ground to the negative terminal of the battery?

Best Answer

Yes - just remember that your ground in that case will only be relative to the battery. If you go to connect this to another device (serial interface, etc) you need to link the ground lines so they're a common ground.

So long as it is isolated, you're fine.