3 ms·

Yes gound is necessary for every connected device. Actually passive power on the same communication wire as 1-Wire has actually is not part of the functionalit

Yes gound is necessary for every connected device. Actually passive power on the same communication wire as 1-Wire has actually is not part of the functionalities of PJON, could be developed and is something I am considering to add in future.

roel_v 11y ago
But quite often the ground isn't the same level at all points in an installation, so you need to run two wires between the two Arduinos. Not picking on you, I'm just saying that this is a very confusing item for an electronics amateur like myself. Modbus is the same - many manufactures claim 'works with two wires' but then leave out that you need a ground, so that in pretty much every real-world application you end up running three wires. So as a constructive feedback, I'd like to suggest that you either make the term very explicit or talk about '2 wire' instead of '1 wire' (I realize that that makes it harder to 'compete' against 1-Wire (which also needs two wires...) before people who don't really understand what's involved, but I think that that price is paid back by the goodwill you get from being 'honest', because 'dishonesty' is what it often feels like when people claim 'one wire' systems that turn out to require two wires, even if for an EE it's obvious what is meant by 'one wire')
- jonsen 11y ago
  "A ground loop is the result of careless or inappropriate design or interconnection of electrical equipment that results in there being multiple paths to ground where this is not required, so a complete loop is formed.": https://en.m.wikipedia.org/wiki/Ground_loop_(electricity) https://en.m.wikipedia.org/wiki/Ground_loop_(electricity)
  - gioscarab 11y ago
    Really interesting article thank you!!!!
- gioscarab 11y ago
  I'm not thinking you are picking on me. Thank you for your feedback, I will for sure have to make clear this point to help people to have a clearer vision on how to engineer their networks properly. Working with a home automation application an using the house ground as ground I didn't consider that in other application this could be a real problem.

roel_v 11y ago

But quite often the ground isn't the same level at all points in an installation, so you need to run two wires between the two Arduinos. Not picking on you, I'm just saying that this is a very confusing item for an electronics amateur like myself. Modbus is the same - many manufactures claim 'works with two wires' but then leave out that you need a ground, so that in pretty much every real-world application you end up running three wires. So as a constructive feedback, I'd like to suggest that you either make the term very explicit or talk about '2 wire' instead of '1 wire' (I realize that that makes it harder to 'compete' against 1-Wire (which also needs two wires...) before people who don't really understand what's involved, but I think that that price is paid back by the goodwill you get from being 'honest', because 'dishonesty' is what it often feels like when people claim 'one wire' systems that turn out to require two wires, even if for an EE it's obvious what is meant by 'one wire')

jonsen 11y ago
"A ground loop is the result of careless or inappropriate design or interconnection of electrical equipment that results in there being multiple paths to ground where this is not required, so a complete loop is formed.": https://en.m.wikipedia.org/wiki/Ground_loop_(electricity) https://en.m.wikipedia.org/wiki/Ground_loop_(electricity)
- gioscarab 11y ago
  Really interesting article thank you!!!!
gioscarab 11y ago
I'm not thinking you are picking on me. Thank you for your feedback, I will for sure have to make clear this point to help people to have a clearer vision on how to engineer their networks properly. Working with a home automation application an using the house ground as ground I didn't consider that in other application this could be a real problem.