The Barometer Bricklet is now available:
It uses the very precise MS5611-01BA01 air pressure sensor. While testing we found out that it is really easy to detect doors being opened and closed. In the 0.01mbar range the air pressure is changing quite a bit. So if you want to reach a stable altitude calculation with this resolution (10cm) you will need to do some sensor fusion with a motion sensor, like the IMU Brick.
On a related note: We changed our circuit board supplier. Starting with the Barometer Bricklet, all of the circuit boards we are using will be “Made in Germany”:
Now the whole manufacturing process (PCB production, PCB assembly and testing) is done in Germany!