Capacitive Sensing--Part II Use of shield: Another way of
increasing the electric field projection is through the use of a
shield. In Figure 3, there is a ground pattern surrounding the
sensor (blue area – representation of hatch pattern). This hatch
is generally connected to ground. In the case of proximity
sensors, this leads to lower electric field strength at greater
distances, as shown below. Capacitive sensing controllers
generally come with a shield electrode pin which is driven with
the same voltage as that of the sensor. For proximity sensors,
the hatch should be connected to this shield electrode. Linear /
Radial slider Sliders are gaining popularity for volume or
intensity control. These can be laid out in different shapes,
including linear and circular. A slider is actually a group of
multiple independent sensors placed physically adjacent to each
other. Actuation of one sensor results in the partial actuation
of adjacent sensors. The actual position of the slider is found
by computing the centroi