Here's the riddle that needs to be solved: how to measure vertical linear movement?
Four sensors with a travel range of 10cm are needed.
Two sensors with a range double of this, so around 20cm.
Right now I'm using a combination of four bend sensorshttp://www.sparkfun.com/products/8606
-> They have the "feel" that we need - constant, small weight.
-> They are not very stable, robust or precise.
And one of these - a drawstring linear displacement sensorhttp://www.pennyandgiles.com/Draw-Wire-Linear-Sensors-pd-61,3,,.php
-> Very stable and precise, long range.
-> The "feel" is not quite right. Because of the spring in this sensor, it feels "heavy" when pulled.
So, my idea was "super smooth linear faders" with weights,
but these turn out very hard to find especially in lengths > 10cm.
Do any of you guys have any ideas for other sensors or setups to reach this goal?
All suggestions very much appreciated,