An apparatus for dispensing solid pharmaceutical articles includes a dispensing bin having a solid pharmaceutical article storage chamber therein, and a sensor system. The sensor system includes a sensor having first and second electrodes in the storage chamber, and a controller coupled to the sensor. The sensor is configured to generate a detection signal indicative of a capacitance. The controller is configured to detect a presence of one or more solid pharmaceutical articles in the storage chamber based on the capacitance indicated by the detection signal. Related methods and computer program products are also discussed.
