4*4 Matrix Array/Matrix Keyboard 16 Key Membrane Switch Keypad for arduino 4X4 Matrix Keyboard

Description

A keypad is often needed to provide input to an Arduino system, and membrane-type keypads are an economical solution for many applications. They are quite thin and can easily be mounted wherever they are needed.   

Conclusion

This is a very simple example, but I think you can see how easy it is to get keypad input to your Arduino program. You can use this type of input for many different projects, including:

• Door lock
• Input PWM
• Alarm clock
• Security lock