[fhars]

The large chip on the image seems to have a number starting with 16F (or maybe 18F), so it seems to be some PIC microcontroler in a 20QFN package. The other two black objects on the board seem to be the accelerometer and light sensor, there are loads of these available in these sizes from your favorite parts suppliers.

According to the (german) page https://pdb.bfh.ch/search/pdbwebviewdetail.aspx?lang=de&proj... they are currently working on a next version that does also include air pressure and magnet field measurements.