TrackpointSensor
From base48
Trackpoint Sensor
Founder:
martian742
Status:
active
Created:
2012-05-01
Last Modified:
2013-02-12
Contents
synopsis
The trackpoint type sensor has 4 resistive pieces embedded. They change their resistance insignificantly upon physical force applied to the stick. There are 4 resistors in total, 2 per axis.
the pinout
| Xaxis+ | Yaxis+ | Xaxis- | Yaxis- |
| pin1+pin2 | pin2+pin3 | pin4+pin5 | pin5+pin6 |
The resistance of every segment is approx. 3.2k. It changes +/- 10ohm upon finger-pressure. On the positive part of every axis, the pressure increases the resistance when directed to the right or up.
challenges
- temperature drift:
- "Due to the significant temperature sensitivity of the force sensors, it is necessary to recalibrate the zero force origin of each axis on a periodic basis."
- making it talk USB-HID to be compatible with any OS
