Abstract: Capacitive identification systems and methods are described. The system may include a capacitive detector configured to identify objects having capacitive identifiers. A capacitive identifier may be a patterned dielectric ink that, when placed in an electromagnetic field generated by the capacitive detector, detectably alters the capacitance of neighboring sensors in the detector. The capacitive detector may be disposed within an opaque housing structure of a device and configured to detect the capacitive identifier through the opaque housing structure. The capacitive detector may include a capacitive sensing array and processing circuitry formed on a common printed circuit. The capacitive detector may be formed in an infusion pump system. The capacitive identifier may be disposed on a pump cassette for the infusion pump system.