A fast and precise environmental sensor that can measure temperature, pressure, and altitude. This BMP280 breakout is Raspberry-Pi and Arduino-compatible.
If you're looking for a simple temperature and pressure sensor, then this is the one to pick. It's cheap and accurate (±1 hPa, ±1.0°C, ±1 metre), and ideal for keeping track of temperatures around your home or even for measuring altitude in high-altitude balloon flights.
Kit includes
They've designed this breakout board so that you can solder on the piece of right angle female header and pop it straight onto the bottom left 5 pins on your Raspberry Pi's GPIO header (pins 1, 3, 5, 6, 9). The right angle header also has the advantage of positioning the breakout away from the Pi's CPU so as to minimise radiated heat.
The Python library for the BMP280 makes it simple to take readings from the sensor.
Please Note: The software does not support Raspbian Wheezy.
Notes