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Touch Sensor

Touch sensor works on principle of change of capacitance due to contact by hand. Under normal circumstances the door knob or the object being protected has a certain capacitance which is constant. When this object is touched by hand then the capacitance changes. This type of sensing is useful to protect door knobs, safes or any metallic item. Such systems can cause false alarms during rainy season. It is important that this kind of sensing is not used for objects that are directly exposed to rain as dampness can cause change in capacitance.

Some companies overcome this problem by reducing the sensitivity of the sensor and ensuring that the rain does not fall directly on the item being protected.

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