Basically, using the 4 digit 7 segment tm1637 module and 4*4 matrix keypad.
I want to be able to type numbers on keypad, and the display will continue showing till 4th number. When I press * or #, it should clear the display. Now with the "A", "B" ,"C", "D" keys, I want a pin to pull high when I press "A" , when I press "B" pull low "A" 's pin and pull high another pin for B (4 Letters like a selector switch, to control a relay).
Could someone type the code for me please?