3DChameleon OLED Cover with Command Button

I like the idea of controlling the 3D Chameleon with a GPIO signal from my 3D printer's control board. This is easily accomplished using the signal line and ground of the switch input connecter. The only problem is that commands cannot be issued without writing a GCode script to print. I found that if I connected a switch in parallel with the GPIO connection, I could easily enter commands. 

With this revision of the OLED Display Cover, I've added a tab to press a microswitch I removed from a broken end stop switch (without the plate). I also added two pilot holes to mount and align the switch using the supplied screws.

I constructed an adapter cable to split the signal and ground on the switch connector. I soldered the wires for the switch directly while the other end of the adapter has a 3 pin male DuPont connector with only 2 filled to reflect the original connection.

After printing the cover, press the tab from the inside and pull it out enough that it remains protruded about 1mm from the surface. Then mount the switch and verify that it only triggers when the tab is pressed. Depending on what material the cover is printed with, it might help to heat the face of the cover on the bed set to 90-100°C to soften the tab for adjusting.

Note: This technique WILL NOT work with the supplied switch mechanism! That switch actively uses the +5v line and cannot be connected in parallel with another switch.