Touch sensing is fast becoming an alternative to traditional pushbutton switch user interfaces, because it requires no mechanical movement and it enables a completely sealed and modern-looking design. Expanding beyond the consumer market, touch sensing is beginning to take hold in medical, industrial and automotive applications for reasons such as aesthetic, maintenance, low cost and cleanliness.
Cypress Microchip's mTouchTM Sensing Solution provides a free and easy method for designers to add touch sensing to applications utilizing microcontrollers.
Capactive Switch basically is a pair of adjacent plates (please refers below figure). Small edge to edge capacitance is present, the intent of the switch layout is to minimize the capacitance between these plates. When a conductive object like figure is placed in proximity to the two plates, (refer fig. B), there is a capacitance between one electrode and the conductive object and a similar capacitance between the conductive object and the other electrode.
The most common form of capacitance switch array is a set of capacitors where one side of each is grounded. Thus the active capacitor has only one accessible side; the switch is grounded variable capacitor.The presence of the conductive object increases the capacitance of the switch to ground. The switch action is determined by measuring the change in the capacitance.
Capsense technology can be applied to varies applications, such as … |
