Connect the push buttons keypad to Arduino Uno as shown in circuit diagram.(R1~A0,R2~A1,R3~A2,R4~A3,C1~A4,C2~A5,C3~Pin 2,C4~Pin 3).Also take a extra push button(Reset Button) and connect to Arduino.(Reset,GND).Connect all the pixel LEDs.(-Ve/GND~GND,+Ve/5V~5V,Data...