The QT140 / QT150 charge-transfer (“QT”) QTouch ICs are self-contained digital controllers capable of detecting near-proximity or touch on 4 or 5 electrodes. They allow electrodes to project independent sense fields through any dielectric like glass, plastic, stone, ceramic, and wood. They can also turn metal-bearing objects into intrinsic sensors, making them responsive to proximity or touch. Each of the channels operates independently of the others, and each can be tuned for a unique sensitivity level by simply changing its sample capacitor value. The devices are designed specifically for human interfaces, like control panels, appliances, gaming devices, lighting controls, or anywhere a mechanical switch or button may be found; they may also be used for some material sensing and control applications.