Datasheet

Wire up the sensor as shown in the Wiring section, for I2C. Connect the GND pin to ground,

VIN pin to 5V and connect SDA to your Arduino's SDA pin, SCL to SCL pin

On UNO/Duemilanove/etc, SDA == Analog 4, SCL == Analog 5

On Leonardo/Micro, SDA == Digital 2, SCL == Digital 3

On Mega/ADK/Due, SDA == Digital 20, SCL == Digital 21

Upload the sketch and open up the serial console at 9600 baud. You should see that the

CAP1188 is found (good!) and then you can touch the C1 thru C8 pads with your fingers to

see the touch sensor go off. When you touch a pin, you'll also see the matching LED light up.