A touch control lamp includes a shell having an outer surface, on which a plurality of touch control sections are defined, and an accommodation, a circuit board disposed in the accommodation of the shell, and a plurality of light sources and a plurality of capacitive touch sensors, which are mounted on the circuit board in a way that each of the capacitive touch sensors is electrically associated with at least one of the light sources. Each of the capacitive touch sensors spacedly corresponds in position to one of the touch control sections on the outer surface of the shell. The touch control lamp can integrate multiple functions of illumination, decoration and interactive gameplay.

A capacitance-type sensing system for indirect contact includes a capacitance-type sensor and a grounding conductor. The capacitance-type sensor includes a sensing electrode and a driving circuit electrically connected to the sensing electrode. The driving circuit has a grounding terminal. The grounding conductor is electrically connected to the grounding terminal and configured to contact a grounding surface. A contact area of the grounding conductor is greater than or equal to 3000 mm.sup.2.

A capacitance-type sensing system for indirect contact includes a capacitance-type sensor and a grounding conductor. The capacitance-type sensor includes a sensing electrode and a driving circuit electrically connected to the sensing electrode. The driving circuit has a grounding terminal. The grounding conductor is electrically connected to the grounding terminal and configured to contact a grounding surface. A contact area of the grounding conductor is greater than or equal to 3000 mm.sup.2.

In a capacitive touch sensing circuit, a parallel capacitor is coupled to a first input terminal and an output terminal of an operational amplifier. A series capacitor and a sensing capacitor are coupled in series between first input terminal and ground. A test capacitor is coupled to a second node and ground. A first switch is coupled to an operating voltage and a first node. A second switch is coupled to first node and ground. A third switch is coupled to second node and ground. A fourth switch is coupled to operating voltage and second node. A first current source and a fifth switch are coupled between operating voltage and first node. A sixth switch and a second current source are coupled between first node and ground. A seventh switch is coupled to second node and a third node. An eighth switch is coupled to the parallel capacitor.