16 Key 4*4 Membrane Switch Keypad 4*4 4X4 Matrix Array Matrix Keyboard for arduino DIY KIT M.(4*2)
The 4*4 matrix keypad usually is used as input in a project. It has 16 keys in total, which means the same input values.
The SunFouner 4*4 Matrix Keypad Module is a matrix non- encoded keypad consisting of 16 keys in parallel. The keys of each row and column are connected through the pins outside – pin Y1-Y4 as labeled beside control the rows, when X1-X4, the columns.