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Project Hardware > Keypads
This keypad has 16 buttons, arranged in a 4x4 grid. It is made of flexible, thin membrane material.
The keys are connected into a matrix, so you will only need 8 pins of a microcontroller (4-columns and 4-rows) to connect to it.
The 4*4 matrix keypad is usually used as an input in a project. It has 16 keys in total, with the same input values.
The TTP229 is a digital capacitive touch keyboard, capacitive touch does not require pushing force like regular buttons, but instead, the touch of a finger alters the electrical field between the layers of the keypad.