Am 01.06.2016 um 21:07 schrieb Peter Hollenbeck:
> My DS18B20 works over 34 feet of Cat5e but not over 160 feet.
> Resistance for the 160 foot wire is 4.7 ohms, 0.29 ohms per foot.
> Resistance for the 34 foot wire is 0.9 ohms, 0.26 ohms per foot.
>
Resistance is the limiting factor if you are delivering power through
the cable. Do you?
In all other cases, resistance, inductance, capacitance is the limiting
factor, at they all lengthen the rise times of signals over the limit.
What kind of host circuit do you use? The infamous 4,7k to 3.3V pullup?
> I have read that 1wire is good for 100 meters over Catx.
>
Simple telephone wire is better for Onewire.
Kind regards
Jan
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