>>> I got a slope of 3.86E-14/hPa frequency difference versus pressure.
>
> Did you also control for temperature ?
>
> Air pressure, in particular at high relative humidities changes the
> thermal properties of air so there is bound to be some cross coupling
> were temperature sensitivities appear as pressure sensitivity.
What are time-nuts using for monitoring the environment?
I have been playing a little with the Bosch BME280 - doing air pressure,
temp and relative humidity in a small form factor. Easy to interface to
Raspberry Pi or Arduino.
https://www.bosch-sensortec.com/bst/products/all_products/bme280
https://github.com/adafruit/Adafruit_Python_BME280
http://www.satsignal.eu/raspberry-pi/monitoring.html#BME280
--
Björn
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