Hi,

I have a DS18B20 in the loft space of my house which is currently 
reading 64.25 degrees C, and I know it is 10 C at the most.  Not really 
a problem but it does give me the opportunity to investigate a sensor 
that I know is reading incorrectly.

This raises the question - is there any way to tell that is has failed 
from looking at any info from the sensor, any error registers?  The 
Dallas sheet seems to suggest that the crc8 value can be used, but I am 
not sure how to do it, any ideas?

Thanks
Mick

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