I am trying to design a new layout for a slider in the form for an arc of a circle. I have four pads on the arc. I have configured this to be a radial slider. But when I use the API to get the centroid position the maximum value of the centroid gets stuck at 3/4 of the resolution and in my case 75/100. I removed the last pad from the slider so that it had 3 pads but then it gets stuck to a maximum value of 2/3 of the resolution ie. around 66.
The radial slider in the capsense datasheet is defined as
"A radial slider is similar to a linear slider except that the sensors are placed in a circle"
Does this mean that I cannot have just a portion of the circle as layout for a radial slider and the last slider pad has to be close to the first slider pad?
The layout of the pads is attached in the PNG file.
"Does this mean that I cannot have just a portion of the circle as layout for a radial slider and the last slider pad has to be close to the first slider pad?"
I think that you are quite right. The calculation of the actual finger position always includes the next pad which isn't there for your arc.
I would suggest you to define your layout as a linear slider.