A proximity sensor has a resonant circuit which when stimulated by a pulse produces
a signal with decaying oscillations. The number of such oscillations above a signal
threshold varies in relation to the distance between a metal object and the proximity
sensor. The sensor operation is configured by deriving a function that defines
how the performance of a given proximity sensor deviates from performance reference
data. The function is employed to normalize the count of oscillations produced
by the given proximity sensor and the normalized count is used to determine presence
of an object. By normalizing sensor performance, common configuration data can
be used to setup a given proximity sensor without having to take into account specific
performance variations of that sensor.
