We decided to deal with “Selection interaction” Prof.Ian “You can experiment on the ‘selection interaction.’ I think it would be better to refer to this article(Towards a standard for pointing device evaluation, perspectives on 27 years of Fitts’ law research in HCI).”

Hacking Trackpoint (Plan A)

We found out what 4 pinouts are (SP_X, SP_Y, SP_Z, SP_G)
SP_Y + SP_Z = ↑
SP_Y + SP_G = ↓
SP_X + SP_Z = ←
SP_X + SP_G = →

Prof.Ian guess 2 of 4 are related to power and ground(GND)
We concluded that Trackpoint can not be used without a existing IC chip.

Go with Plan B at the same time

We soldered trackball input.
We are going to connect

1. hacked keyboard - Arduino + A type USB-host shield 
   
2. Arduino + Bluetooth module - Hololens
   

   

   
   ->Bluetooth module<-