In the Example.pde within the examples folder of the linked library there is a description how to wire the sensor to the Arduino Mega (it does only work with a Mega). Have you tried that example? If not, do it.
In the Example.pde within the examples folder of the linked library there is a description how to wire the sensor to the Arduino Mega (it does only work with a Mega). Have you tried that example? If not, do it.