I'm trying to use a 18B20 sensor connected to a USB dongle. I've put
the 18B20 sensor directly on an RJ-11 connector. I've connected the
18B20 Vcc connector to the USB Gnd. When I plug it directly to the
dongle it works fine. If I put it on a 12 meter cable it stops
working. Do I need to power the
Are you certain that the extension cable doesn't reverse polarity?
Paul
On 3/3/07, Pedro Côrte-Real <[EMAIL PROTECTED]> wrote:
I'm trying to use a 18B20 sensor connected to a USB dongle. I've put
the 18B20 sensor directly on an RJ-11 connector. I've connected the
18B20 Vcc connector to the USB
On 3/3/07, Paul Alfille <[EMAIL PROTECTED]> wrote:
> Are you certain that the extension cable doesn't reverse polarity?
I think not. I've tried with a cable I did myself and one I bought and
I've used a cable tester on them. Everything seems to check out.
Pedro.
-
what kind of cable did you use, flat telephone, shielded or unshielded
twisted AWG24? Have you checked for parasitic noise sources near it?
once I tried a 'T' topology with unshielded AWG24s in a noise free
environment and I got several glitches.
Pedro Côrte-Real wrote on 3/3/2007 22:38:
On 3/
On 3/3/07, Pedro Côrte-Real <[EMAIL PROTECTED]> wrote:
> On 3/3/07, Paul Alfille <[EMAIL PROTECTED]> wrote:
> > Are you certain that the extension cable doesn't reverse polarity?
>
> I think not. I've tried with a cable I did myself and one I bought and
> I've used a cable tester on them. Everythin
On 3/3/07, George M. Zouganelis <[EMAIL PROTECTED]> wrote:
> what kind of cable did you use, flat telephone, shielded or unshielded
> twisted AWG24? Have you checked for parasitic noise sources near it?
>
> once I tried a 'T' topology with unshielded AWG24s in a noise free
> environment and I got s
Am Samstag, 3. März 2007 21:14 schrieb Pedro Côrte-Real:
> Do I need to power the 18B20 with Vcc for this distance?
>
No. Power requirement of the DS18B20 is max. 1.5mA, which causes only a
voltage drop in the mV range even on long and thin 1W and GND lines.
Check for contact problems at the con
On 3/3/07, Jan Kandziora <[EMAIL PROTECTED]> wrote:
> Am Samstag, 3. März 2007 21:14 schrieb Pedro Côrte-Real:
> > Do I need to power the 18B20 with Vcc for this distance?
> >
> No. Power requirement of the DS18B20 is max. 1.5mA, which causes only a
> voltage drop in the mV range even on long and t
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