A portable electronic device, comprising: an enclosure (110, 112, 512, 712, 732, 752, 812, 832, 852, 872, 892, 910, 1010, 1130, 1150) at least partially defining an internal cavity (412, 715, 735, 755); a display cover (112, 912, 1012, 1112, 1132, 1152) coupled with the enclosure (110, 112, 512, 712, 732, 752, 812, 832, 852, 872, 892, 910, 1010, 1130, 1150) and defining an opening; a sensor assembly (106, 506, 706, 726, 746, 826, 846, 866, 906, 1006, 1106, 1126, 1146, 1306, 1316, 1326, 1346, 1356) carried by the enclosure (110, 112, 512, 712, 732, 752, 812, 832, 852, 872, 892, 910, 1010, 1130, 1150) and at least partially disposed in the internal cavity (412, 715, 735, 755), comprising: a sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) disposed within the opening; a solid-state sensor comprising a first capacitive layer (402a, 402b) and a second capacitive layer (402a, 402b), the solid-state sensor configured to provide a signal in response to a touch input on the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) moving the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) and causing a reduction in distance (d) between the first capacitive layer (402a, 402b) and the second capacitive layer (402a, 402b); a fingerprint sensor (304, 524, 724, 1105, 1125, 1145) positioned between the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) and the solid-state sensor; and a haptic actuator configured to provide, based on the signal, a vibration that mimics a mechanical button press. an enclosure (110, 112, 512, 712, 732, 752, 812, 832, 852, 872, 892, 910, 1010, 1130, 1150) at least partially defining an internal cavity (412, 715, 735, 755); a display cover (112, 912, 1012, 1112, 1132, 1152) coupled with the enclosure (110, 112, 512, 712, 732, 752, 812, 832, 852, 872, 892, 910, 1010, 1130, 1150) and defining an opening; a sensor assembly (106, 506, 706, 726, 746, 826, 846, 866, 906, 1006, 1106, 1126, 1146, 1306, 1316, 1326, 1346, 1356) carried by the enclosure (110, 112, 512, 712, 732, 752, 812, 832, 852, 872, 892, 910, 1010, 1130, 1150) and at least partially disposed in the internal cavity (412, 715, 735, 755), comprising: a sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) disposed within the opening; a solid-state sensor comprising a first capacitive layer (402a, 402b) and a second capacitive layer (402a, 402b), the solid-state sensor configured to provide a signal in response to a touch input on the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) moving the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) and causing a reduction in distance (d) between the first capacitive layer (402a, 402b) and the second capacitive layer (402a, 402b); a fingerprint sensor (304, 524, 724, 1105, 1125, 1145) positioned between the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) and the solid-state sensor; and a sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) disposed within the opening; a solid-state sensor comprising a first capacitive layer (402a, 402b) and a second capacitive layer (402a, 402b), the solid-state sensor configured to provide a signal in response to a touch input on the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) moving the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) and causing a reduction in distance (d) between the first capacitive layer (402a, 402b) and the second capacitive layer (402a, 402b); a fingerprint sensor (304, 524, 724, 1105, 1125, 1145) positioned between the sensor cover (202, 502, 702, 722, 902, 1002, 1112, 1122, 1142, 1202, 1302, 1312, 1322, 1342, 1352) and the solid-state sensor; and