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tpa81 i2c sensor read error with net cable connected

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#1 dexmac


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Posted 03 June 2012 - 01:34 PM

hi to all i'm developing with netduino plus and tpa 81 sensor on i2c. when network cable is disconnect temperatures values are good. If i connect network cable, temperatures are all wrong (not 0 but strange values). i'm using firmware 4.2.0 RC4. can someone help me ? thanks in advance dexmac

#2 Coding Smackdown

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Posted 05 June 2012 - 05:29 AM

One of the forums members did a pretty exhaustive test around ADC noise and that is probably what you are seeing. You can find his write up at Hope this helps.
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#3 henryyao



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Posted 30 December 2012 - 05:29 PM

Hi dexmac

I'm having a similar issue as your case, still I'm stuck there.

I keep getting strange value from tap81 like 7,39,46,14,3,0,0,0,0,0

I'm in a normal temperature environment so I guess the correct result should be like 7,25,23,24,23,23,21,23,21,21, stuff like that.


So did you figure out the reason for that?







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