Trying to open proprietary medical sensors and connect them to the Internet.
Connecting a personal medical sensor device to the Internet enables storing measurements over time (compared to a single measurement displayed on the device display). A connected sensor is thus more valuable than a stand-alone device. Connected sensors do exist, but are often quite expensive. On the other hand, Bluetooth modules and Bluetooth enabled Smartphones are readily available and can act as a cheap gateway to the Internet.
[Oct 2012] “voodoo” interface, oscilloscope measurement:
[Nov 2012] intercepting the i2c bus:
[Nov 2012] talking to the EEPROM (i2c multi master setup):