The PCB must be mounted floated, otherwise key presses don't work reliable. Connect pins 3 and 4 on connector P1 for 16-pin button mode. Smaller keypads with less pins may work, but are not tested.
After returning the MeArm I borrowed from my former company, I wanted to build one for my own and make use of the spare touchpad. This project uses a dusty Arduino Uno Rev3, an old MB102 power supply ...
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 -> ...
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