Am 02.04.2014 21:00, schrieb Jan Sennesael:
>
> The UTP is approximately 45m long, cat 5e. I am using wire nr 1/2 for
> gnd/+5V and 4/5 for 1wire/gnd (hobbyboard pinout). The sensor worked without
> problems on the tree setup (with a diy usb master), nothing else has
> changed.
>
> The other pairs of the UTP are in use for a distance sensor
> HC-SR04(measuring water level with an arduino)
> When checking the wires i noticed that the resistance between 5V and 1wire
> gnd for this cable was differt to the others: here its approx. 285kOhm.
>
> anyone an idea how to solve this?
>
Are you powering this HC-SR04 through the bus? If yes, how much current
does it draw? This current has to flow back through the GND wire and may
lift the GND level on the far end on long, thin GND wires an substantial
amount, creating communication problems.
Kind regards
Jan
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