With a 10 megohm resistor the sensor will start to respond 4-6 inches away.Use a 1 megohm resistor (or less maybe) for absolute touch to activate.Here are some guidelines for resistors but be sure to experiment for a desired response. A receive pin is connected to the send pin via a medium to high value resistor. For the Capsense library, the arduino uses one send pin and any number of receive pins required. One way of using capacitive touch in a project is to use the CapSense library. The capacitance may be very small, nevertheless the Arduino measures it with accuracy. The capacitance of this capacitive touch sensor depends on how close your hand is to the plate.īasically the arduino measures how much time the capacitor (i.e the touch sensor) takes to charge, giving it an estimate of the capacitance. The more its capacitance, the more charge it can store. The sensor plate and your body forms a capacitor. Can detect a hand from a few inches away, if required.Can be easily used in place of a button.Can be concealed under any nonmetallic mmaterial.Each touch sensor requires only one wire connected to it.It may be used to sense human touch through more than a quarter of an inch of plastic, wood, ceramic or other insulating material (not any kind of metal though), enabling the sensor to be completely visually concealed. Therefore here I have a simplified explanation.Ĭapacitive touch sensing is a way of human touch sensing, that requires little or no force to activate. However, if you are a novice in Arduino, I' m pretty sure you'd understand only half of what's written there. The arduino playground has a good explanation of the Capsense library. For most capacitive sensing related projects, I used the CapSense library.
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