Abstract: Ingestible radio frequency identification (RFID) tags are disclosed. A system embodiment includes, but is not limited to, an RFID tag including a flexible substrate foldable between a planar configuration and a tubular configuration, a conductive element disposed on the flexible substrate, and an RFID tag chip electrically coupled with the conductive element; a capsule structured and dimensioned for ingestion by a biological subject, the capsule including a shell structured and dimensioned to enclose a medication for the biological subject simultaneously with the RFID tag when the flexible substrate is in the tubular configuration, but not when the flexible substrate is in the planar configuration; and a pH switch structure coupled to an exterior surface of the capsule, the pH switch configured to deactivate the RFID tag in a first configuration and to permit activation of the RFID tag in a second configuration within the biological subject.

Abstract: Ingestible radio frequency identification (RFID) tags are disclosed. A system embodiment includes, but is not limited to, an RFID tag including a flexible substrate foldable between a planar configuration and a tubular configuration, a conductive element disposed on the flexible substrate, and an RFID tag chip electrically coupled with the conductive element; a capsule structured and dimensioned for ingestion by a biological subject, the capsule including a shell structured and dimensioned to enclose a medication for the biological subject simultaneously with the RFID tag when the flexible substrate is in the tubular configuration, but not when the flexible substrate is in the planar configuration; and a pH switch structure coupled to an exterior surface of the capsule, the pH switch configured to deactivate the RFID tag in a first configuration and to permit activation of the RFID tag in a second configuration within the biological subject.

Abstract: A digital keypad input device comprises a controller for driving a plurality of I/O signal lines selectively in input, output, and high impedance states. Each line operated in the output state presents an output logic signal that is detected, via a corresponding switch when closed, by another I/O line operated in the input state. Other lines are operated in the high impedance state. The method of the invention enables the number of manual switches to exceed the number of I/O lines.

Abstract: A digital multimeter (DMM) includes a microprocessor controller programmed for simulating operation of a plurality of DMM's by providing concurrent and substantially simultaneous displays of results of plural time-shared measurements. The microprocessor controls a single measurement and data conversion system to perform a plurality of separate measurements in a time-shared manner. Results of the plurality of separate, sequentially performed, measurements are concurrently displayed, substantially simultaneously, on a plurality of separate displays of the digital multimeter in accordance with the operation of the controller. The single multimeter of the invention thus simulates operation of a plurality of DMM's.