Donovan Parks wrote:
>
> Hello Tony,
>
> Have you placed the 4 DS18S20's next to each other to see how close there
> readings are?  I would be very curious to know if they are all in agreement
> to within +/-0.5 degree C.  I only have a single DS18B20 and have no
> realiable way to see if it is even close to accurate (expect that it feels
> like 20 degree and reads 20 degree! :)  ).  Let me know the result if you
> can find the time to do this experiment.
>
> Regards,
> Donovan

Hi Donavan,

Here is a short burst from the logger with the weight info deleted.
All the sensors are sitting next to each other on the bench. There seems
to be a slight temp rise going on.

The humidity might need some filtering, it's pretty much raw from the
A2D, as it jitters around a bit. The humidity data shown is after a
short breath into the sensor housing.


Log Interval = 1 seconds
Logging commenced on 9/04/02 at 13:29:56
--------------------
Count  Time      Temp 1    Temp 2    Temp 3    Temp 4    Humid %
0001   13:36:45  + 21.75   + 21.43   + 21.68   + 21.56   61.2
0002   13:36:46  + 21.75   + 21.43   + 21.68   + 21.56   61.2
0003   13:36:47  + 21.75   + 21.43   + 21.68   + 21.56   61.5
0004   13:36:48  + 21.75   + 21.43   + 21.68   + 21.56   61.5
0005   13:36:50  + 21.75   + 21.43   + 21.68   + 21.62   60.2
0006   13:36:51  + 21.75   + 21.43   + 21.68   + 21.56   62.3
0007   13:36:51  + 21.75   + 21.43   + 21.68   + 21.56   64.6
0008   13:36:53  + 21.75   + 21.43   + 21.68   + 21.62   68.4
0009   13:36:54  + 21.75   + 21.43   + 21.68   + 21.62   71.7
0010   13:36:55  + 21.75   + 21.43   + 21.68   + 21.56   74.1
0011   13:36:56  + 21.68   + 21.43   + 21.68   + 21.62   75.3
0012   13:36:57  + 21.75   + 21.43   + 21.68   + 21.56   76.1
0013   13:36:58  + 21.75   + 21.43   + 21.68   + 21.56   77.5
0014   13:36:59  + 21.75   + 21.43   + 21.68   + 21.62   77.2
0015   13:37:00  + 21.75   + 21.43   + 21.68   + 21.62   76.1
0016   13:37:01  + 21.75   + 21.43   + 21.68   + 21.56   75.0
0017   13:37:02  + 21.75   + 21.43   + 21.68   + 21.62   74.8
0018   13:37:03  + 21.75   + 21.43   + 21.68   + 21.62   73.6
0019   13:37:04  + 21.75   + 21.43   + 21.68   + 21.62   72.8
0020   13:37:05  + 21.75   + 21.43   + 21.68   + 21.56   71.7
0021   13:37:06  + 21.75   + 21.43   + 21.68   + 21.62   71.5
0022   13:37:07  + 21.75   + 21.43   + 21.68   + 21.62   70.0
0023   13:37:08  + 21.75   + 21.43   + 21.75   + 21.62   69.7



--
Best regards

Tony

mICros
http://www.bubblesoftonline.com
mailto:sales@bubblesoftonline.com

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