How to measure QNH using BMP085 sensor

[rogeriopimentel]

Hello,

I have a bmp085 sensor but I perceved that my pressure values is QFE. I would like to see QNH pressure. How to do it using arduino? I work in Viracopos Airport here in Brasil, and today morning I compareted my values using BMP085_Unified ( in hPa) and BMP085(in Pa) and is similar values. Howerer, this values seens QFE pressure and I would like to see the QNH. How to do it please? Today morning the QFE was 947,2 hPa and QNH was 1023hPa! My circuit shows 94710Pa. Othe qustion: How to set Adafruit_BMP085 to hectopascal? Adafruit_BMP085_Unified show in hPa!
Thank you
Pimentel
my e-mail: pimentel.feijao@gmail.com