5 x 4 Key Matrix Keypad With Adhesive

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.

Matrix Membrane Keypad Specs:

• Circuit level: 35V DC, 100mA, 1W
• Standard square resistance: <=50mQ/mil
• Contact resistance: 10-500Q (with lead length and material variation)
• Insulation resistance: 100M 100V
• Dielectric withstand voltage: 250VRms (50-60Hz 1min)
• Contact jitter time: <=5ms
• Operating pressure Metal shrapnel type: 220-350g
• Switching stroke Metal dome-type: 0.6-0.8mm
• Storage temperature: -0°C~+60°C16H
• Storage humidity: 70%-90%
• Test humidity: 70%-90%
• vibration: 20G's msx. (10-200HZ, MIL-202, M204, Condition B)
• Line thickness: <=0.13mm