This fork changes the pin initialization logic in the sketch. Instead of specifying the pin numbers in the constructor, you must specify them in the begin function called in void setup.
This is my Ardoaino ttp229 library!
Copy the "TTP229" library folder to your /libraries/ folder. Restart the IDE (close and open again).
Then in Arduino IDE: File -> Examples -> TTP229 -> KeyToSerial. File -> Examples -> TTP229 -> Calculator.
Follow the connection instructions at the beginning of each sample! In addition I've included a picture that illustrates the connections.
Enjoy :)