Button Pad 4x4 - Breakout PCB - (AD23926)

Description:

This is a simple expansion board for button pads. Each LED and button is broken out to the side connectors. The connectors are soldered to the back side of the PCB. We recommend trimming button-side connector wires as short as possible to reduce panel deflection.

Now with footprints for diodes! Use the super cheap 1N4148 through-hole diodes. These can be used to isolate the switches and make decoding easier.

Reference Link