74HC161 ( Presettable synchronous 4-bit binary counter-asynchronous reset) Arduino Matrix Keypad 16 switches are

Matrix Keypad 16 switches are connected to each other with conductive trace underneath the pad forming a matrix of 4×4 grid

Green: + Signal

Recommended control voltage: 5-10V (maximum 10V)

Easy to use with Microcontrollers or even with normal Digital/Analog IC

0 Interface ( 3 foot patch )

74HC161 ( Presettable synchronous 4-bit binary counter-asynchronous reset) Arduino Matrix Keypad 16 switches areIntroduction : 74HC161 is a synchronous presettable binary counter with an internal look head carry. Synchronous operation is provided by having all flip flops clocked simultaneously on the positive going edge of the clock (CP). The outputs (Q0 to Q3) of the counters may be preset HIGH or LOW. A LOW at the parallel enable input (PE) disables the counting action and causes the data at thedata inputs (D0 to D3) to be loaded into the counter on the