This patch allows to readout a 4x4 numpad connected with all 8 wires to the arduino. Use 10 k Resistors on the 4 read-pins on ground to get some pulldown. Testing required.
To use the nodes in your project you should have the michael-altmann/numpad4x4readout library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.