Thanks BobM3 and GregLocock.
To your questions:
1. Yes we are sampling with 100 Hz. We may try to sample with 1000 Hz. The sampling period is usually 5 seconds.
2. the current movement we are looking into is running in just one axis. It is on a rail.
3. for testing purposes we can sense the...
GPS solutions are not possible, as we need to measure a distance of 45 cm with 10 % accuracy.
Displacement sensor i cant also use, as everthing should be tiny, work on battery and inside a box full of materials. So a chip solution is desirable.
My customer wanted us to use an accelerometer to get the curve of the velocity over the position.
We used a 3 axis sensor, with analog output. Here we used a 12 bit ADC.
Now all the effort has been done, but we cant get the exact position of the movement, which is a movement in just one axis...