Mario's changes:
Show CSV for spreadsheets instead of JSON
Use Force mode to measure on demand instead of constantly.
Constants to change oversampling.
Add calculation of Dew point from Temperature/Humidity
This piece of code was combined from several sources:
https://github.com/adafruit/Adafruit_BME280_Library
https://cdn-shop.adafruit.com/datasheets/BST-BME280_DS001-10.pdf
https://projects.drogon.net/raspberry-pi/wiringpi/i2c-library/
Tested on RASPBIAN JESSIE LITE
https://www.raspberrypi.org/downloads/raspbian/
git clone https://github.com/andreiva/raspberry-pi-bme280.git
Dependencies
sudo apt-get install libi2c-dev i2c-tools wiringpi
Compiling
make
Copy binary to /usr/bin
sudo cp bme280 /usr/bin
Now you should be able to run the program, simply by typing
bme280
Output should look like this
{"sensor":"bme280", "humidity":54.36, "pressure":1011.89, "temperature":25.58, "altitude":9.23, "timestamp":1469568295}