This capacitive touch sensor is easily connected to any Arduino compatible using three pins: GND, 5VDC and Signal. The Signal pin can be connected to any digital input. The Signal pin is normally HIGH and goes LOW when someone touches the circle.Documents:DatasheetSchematicDemo Code://This code is an example of the touch sensor connected to pin 2void setup(){ Serial.begin(9600); pinMode(2,INPUT);}void loop(){ Serial.println(digitalRead(2));}