Internet-connected hamster wheel

Hamster wheel with hall sensors for rotation count/speed/direction. The wheel runs silent on a 608 ball bearing. The wheel is decorated with the names of our two hamsters (Pjotr and Ilya, they're Siberian dwarf hamsters), but there is a version of the wheel stl that has no names.

I'm working on a more elaborate write-up of the complete project [here](https://rurandom.org/justintime/w/Internet_of_Hamsters). This includes descriptions of the electronics and software.

In our home, an attached ESP8266 wifi-enabled microcontroller sends statistics that end up in an elastic search server (If you live in Europe, be sure to [ask your hamsters for consent](https://en.wikipedia.org/wiki/General_Data_Protection_Regulation) first).

For those interested in hamster fitness, this has taught me that:
* My hamsters can run at a top speed of 4.9 km/h and on average make 2.5 km/h;
* They almost exclusively use the wheel between 1 and 7 am;
* Combined, the two of them walk a distance of betwee