Electronics > Beginners
Do you have to tie grounds together to get an arduinos IO to works with other...
Beamin:
--- Quote from: Nusa on October 20, 2018, 07:41:38 am ---If there isn't a circuit, no current will flow, and no signal will travel. Doesn't matter what you do at the input or output pins if there's only one wire connected and no ground path to complete the circuit.
This is practically the first thing you learn in any electricity tutorial/book.
--- End quote ---
Yes I know that but my question was how to do it. You often see in designs to build things with one output but I'm guessing they are omitting the ground because its common sense.
For instance your cable TV runs off one conductor to a station miles away. Unless that works off RF where they are sending RF down a cable instead of an antenna but that would be a signal with no return path.
Kjelt:
The only exception I know off are balanced signals, still two wires but there is within a reasonable distance no ground wire needed.
dmills:
Cable telly rides on coax, which last time I checked has a centre conductor AND a surrounding (typically) foil shield, hence two wires.
That it is also wideband RF is irrelevant.
Regards, Dan.
GeorgeOfTheJungle:
You can signal with a current, then don't need a common ground, but still need two wires. When the signal is a voltage, remember that a voltage is a electric potential difference, so you need to have some common ground to know what that difference is.
Beamin:
--- Quote from: dmills on October 20, 2018, 10:33:19 am ---Cable telly rides on coax, which last time I checked has a centre conductor AND a surrounding (typically) foil shield, hence two wires.
That it is also wideband RF is irrelevant.
Regards, Dan.
--- End quote ---
Think about it if you send down RF you don't have to worry about the ground you are just using copper instead of air and the ground doesn't matter its just a shield. I'm almost positive they do that because it would be easier to upgrade from the old system.
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