maybe you have wrong impedance on the wire and the sensor is ok, try to
equalize the impedance of this sensor wire
2013/11/6 Jeff Siddall <[email protected]>
> On 11/05/2013 03:16 PM, Jeff Siddall wrote:
> > On 11/05/2013 01:45 PM, Roberto Spadim wrote:
> >> check the checksum statistics and check if you have short circuits bad
> >> checksums and others problems
> >
> > Everything is zero in the BUS and CRC statistics except for:
> >
> > /statistics/errors/BUS_readin_data_errors: 65
> > /statistics/errors/CRC8_errors: 16
> > /statistics/errors/CRC8_tries: 30678
> >
> > Does anything stand out there?
> >
> > None of that appears to line up with the amount of bad data I am seeing.
>
> I believe I have discovered the issue with my temperature readings and
> dropping devices. One of my DS1825s had a broken pin (AD0). It appears
> when an address pin floats it can really mess up the bus. I took some
> voltage readings and with that sensor connected the bus voltage was
> erratic between 2.5 and 5 V.
>
> With that sensor removed the readings all seem normal again.
>
> Jeff
>
>
>
>
>
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--
Roberto Spadim
SPAEmpresarial
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