Hello all,

I've bought a BMP180 barometric pressure sensor and used an existing
implementation of the conversion formule (as in the PDF mentioned below) to
see it work.

The problem is that the air pressure result is (currently) about 8 full
points off from what I could find on the 'Web that it should be.   The
resulting temperature is in the middle of  two other (though not as precise)
thermometers, and therefore looks to be ok.

I've made sure that the calculation is correct by taking the calibration, UT
and UP values straight from the PDF here:

https://cdn-shop.adafruit.com/datasheets/BST-BMP180-DS000-09.pdf

pull them thru the calculation and getting the exact intermediate results as
well as T and P values back as shown in the PDF.

My question:

Is the sensor supposed to be able to give that different results (internet
shows 1008, 1009 hPa around my position, the sensor shows 1000.47) ?    I
thought that the calibration process and resulting data would not allow for
it ?    What might be causing it ?

Regards,
Rudy Wieser

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