Adafruit Silicone Elastomer 4x4 Button Keypad for 3mm LEDs

So squishy! These silicone elastomer keypads are just waiting for your
fingers to press them. Go ahead, squish all you like! (They're durable
and easy to clean, just wipe with mild soap and water) These are just
like the light up rubber buttons you find on stuff like appliances and
tools, but these are open source and easy to integrate into your next
project.

Each button is 10mm x 10mm square and 10mm tall. There is 5mm of grid
spacing between the buttons. You can 'tile' the button pads
edge-to-edge and they'll grid up correctly. You can also cut the pads
down if you like, the silicone is very soft. The way they're molded,
they give about 3mm of travel when pressed for a very satisfying feel.
They are completely quiet, however.

On the bottom of each button is a conductive pad ring which can close
a properly design contact underneath.

Each button is 10mm tall and can fit a 3mm LED inside quite easily.
5mm LEDs are too big, so stick with 3mm here. The LED is optional,
having it or not does not affect the 'action'. but it's nice to
backlight buttons.

Chances are you don't want to make your own PCB, so pick up a
Trellis, our tile-able driver which can control 16 LEDs + these 16
buttons over I2C