4 x 4 Matrix Keypad

Membrane keypads are an excellent starting point for adding key input to a project because they are inexpensive, long-lasting, and resistant to water. And knowing how to interface them with an Arduino is extremely useful for building a variety of projects that require user input for menu selection, password entry, or robot operation.

Graphic Overlay — Graphic overlays are typically made of polyester because it has better flex life than polycarbonate.

Metal Domes — This layer houses metal domes or polydomes that provide tactile feedback.

Top Circuit Layer — This is typically a polyester printed layer with silver-filled electrically conductive inks. This layer terminates as a flexible tail that connects to the outside world.

Spacer — This layer separates the top and bottom circuits, allowing the switch to remain normally open until the keypad is pressed.

Bottom Circuit Layer — This is typically a polyester printed layer with silver-filled electrically conductive inks. This layer also terminates as a flexible tail.

Rear Adhesive Layer — This layer sticks the keypad to almost anything, which is convenient.

Specifications: