Capacitive sensor deals with capacitance or in simple words capacitor. A capacitance is built between the sensor and the human body when we bring a human body near the sensor. A charge is induced and this charge is picked by the sensor and is translated as a button press. As we move our finger back from the sensor plate the capacitance is lost and circuit breaks.
This video will show you How to control A Chocolate Box with Touch Sensor and Arduino.
This is the hardware connection and the components needed.
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