Use a Wii Balance Board as a bathroom scale.. The idea isn’t new: Related Work. This implementation uses the wiimote Linux Kernel driver with the xwiimote library.

• DIY internet-enabled bathroom scale by Stavros Korokithakis
• Cheap internet-connected scale: Wii Balance Board + Linux by Matt Cutts
• FitScales Android App by @paulburton

• xwiimote with balanceboard support. I build mine from git
• Linux kernel with wiimote module + balanceboard support (Linux >= 3.7)

Implemented using python generators. After > 800 measurements and a standard deviation smaller than 50 gramms emit averaged measurement.

• graphite
• append to file