Keypad — 12 Button

A basic 12 but­ton key­pad for user input. The but­tons are set­up in a matrix for­mat. This allows a micro­con­troller to ‘scan’ the 7 out­put pins to see which of the 12 but­tons is being pressed.Check the exam­ples below for cor­rect pin-outs and such.Doc­u­ments:DatasheetPIC HEX Pad Tuto­r­i­alArduino InstructableArduino Key­pad LibraryAlarm Sys­tem ProjectBil­dr Exam­ple