wire length
japer
Posts: 105
hello
I have a few question about wire and signal transfer
using basic stamp 2.
22 gauge unshielded Twisted pair solid alarm wire has a
17 ohm resistance at 1000 feet.
Is this a good source of wire for simple logic?
Could this wire be used in a resistive circuit ?
Is shielded wire a better choice?
the longest run of wire is 175 feet.
am i forgetting some other factor not considered ?
any help or web link about this matter would be greatly appreciated.
japer
I have a few question about wire and signal transfer
using basic stamp 2.
22 gauge unshielded Twisted pair solid alarm wire has a
17 ohm resistance at 1000 feet.
Is this a good source of wire for simple logic?
Could this wire be used in a resistive circuit ?
Is shielded wire a better choice?
the longest run of wire is 175 feet.
am i forgetting some other factor not considered ?
any help or web link about this matter would be greatly appreciated.
japer
Comments
And, what do you mean by 'simple logic'? TTL or RS-232 or RS-485.
In other words, the faster you try to go; the more the signal deteriorates. And the less prepared for actual communication over distance, the more deterioration too.
If you are using 9600baud RS-232, you will probably be okay without much fanfare. RS-485 with twisted pair will really do well..
If you happen to have 175 feet of wire on hand, try it and see. You can leave it in a coil on your bench and just do a trial hookup.
If you don't happen to have 175 feet of wire, it is cheaper to buy quality. Personally, there is a lot of very high speed 8wire Ethernet cable that is just about as cheap as 2 wires. You can actually use it for many varied projects and send power as well as signals to your remote.
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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)
······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan
· All wire has resistance, there are no perfect conductors.· Big wire (#14)·has less resistance than little wire (#28).
· Yes, you could make a resistor with wire (it would have to be insulated wire or the turns would have to be spaced so they don't touch), but you would need a lot of it.
· Gold conducts a lot better than copper, but gold wire would cost a lot of money.· Aluminum·conducts the best, but not if it gets oxidized (exposed to oxygen) -- and it oxidizes easily.
excellent
as far as simple logic Mr. Kramer high or low back to / hexinverter/ pin on stamp like an alarm contact
also will stick to 9600 baud [noparse][[/noparse]84] speed if i'am saying this right.
I went out this AM and did buy a coil of wire but bought 18 ga., good thing
i read your post Mr. PJ Allen. you know thicker better.
I do have a small amout of cat5 i will try.
I read a post somewhere in this forum about the pitfalls of amateur project and wire
just couldn't find in the search
i was hoping this concept would work
thank alot you guy's
japer
DC will deteriorate over long distances but AC will travel further!
a 12volt line should be fine for 'contact closure' monitoring so long as you have enough voltage at the sensing end!
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·
Steve
"Inside each and every one of us is our one, true authentic swing. Something we was born with. Something that's ours and ours alone. Something that can't be learned... something that's got to be remembered."
It is a bit risky to use TTL this far as it was never intended to transmit or recieve more than a few millimeters.
The problem is tha noise gets into the system and the RS-422/RS-485 are just about the best for noise reduction.
Also they are cheap.
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"When all think alike, no one is thinking very much.' - Walter Lippmann (1889-1974)
······································································ Warm regards,····· G. Herzog [noparse][[/noparse]·黃鶴 ]·in Taiwan