How to introduce a keypad for data entry and output the status on a 7 segment display

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Duplicate the switches 4 set, you will have your keypad

---------- Post added at 18:15 ---------- Previous post was at 18:15 ----------

as well as the led accordingly, then use decoder to decode it to 7 segment ~~

---------- Post added at 18:16 ---------- Previous post was at 18:15 ----------

you might want to consider microcontroller, you just need some codes rather than messy hardwares
 

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