GY-80 BMP085 9-Axis Magnetic Acceleration Gyroscope Module for Arduino

Pros: These are high quality IC's, for a ridiculously cheap price. Default configuration (mostly addresses) is good, IC's are ligned out all in the same way.

Cons: Not all interrupt/data_ready pins are available. The gyroscope has such a connection, but it is not accesible from the pins.

Other: There are boards with more pins and therefore do provide the extra pins from the IC. But if you don't need them, just buy this one!

Pros: Lots of documentation online for each chip, many code examples.

Cons: Accelerometer. I think mine is defective. Out of the box it did not work with resolution +-2g, because z-axis acceleration had really big offset compared to one in the documentation. It is so big that it cannot be corrected by1 byte register. And it keeps growing. Now I am working on +-8g.

Other: The one a received had defective accelerometer. My code that calibrates Accelerometer: https://docs.google.com/document/d/1Qb5MTr0xtmS0hLLehcnQ4Fzel-_SUVWcEz4aTB4WS90/edit