An input device includes a sensor apparatus coupled to a sensing region. The sensor apparatus is operable in at least a first mode or a second mode. When operating in the first mode, the input device is configured to detect a capacitance of the sensor apparatus. When operating in a second mode, the input device is configured to detect a resistance of the sensor apparatus. The input device is further configured to process user inputs in the sensing region based at least in part on the detected capacitance or resistance of the sensor apparatus. In some implementations, the input device may be configured to switch between the first mode and the second mode based at least in part on the detected capacitance or resistance of the sensor apparatus.