I am using linear slider in my project. When I call Get Centroid Position and start sliding my finger over the slider the value at a particular position varies. I have my resolution as 100. When my finger is on button 3 it varies all the way from 24-50. I dont know whats the reason for this.
With that kind of variation it would be pointless to have more than 4 elements in the slider.
Some notes from design manual -
In most cases the default value of 8-bit is appropriate. However, in designs with high signal levels due to thin overlays or large sensor areas 16–bit resolution should be selected. Because sliders calculate finger position using relative signal levels of adjacent sensors, saturation causes non-smooth operation and 16-bit resolution may be required.
Widget Resolution: Select 8-bits unless you are using a slider and the signal is saturating due to thin overlay or large sensor area, then select 16-bits
7.4.1 Opamp Output Pins The opamp outputs are directly connected to P0, P0, P3, and P3. If these pins are used for CapSense, the opamps become unusable. These pins have higher CP because they are directly connected to opamp outputs. Therefore, these four pins should not be used for CapSense. If you must use these pins, they should be used for buttons and should not be used as sliders or touch pads. Also, the traces for these pins should be short to help reduce CP.