(Solved): I have to design a keypad decoder which converts into a bcd digit I want to know the design proced ...

I have to design a keypad decoder which converts into a bcd digit

I want to know the design procedure

like either using hiearchial design or functional blocks with truth table, k map and the boolean expression and logic diagram.

In the system, the user sets the resident's average sleep duration (1-8 hours) using a keypad as below. Each button is identified by row $$\left(X_i\right)$$ and column $$\left(Y_i\right)$$ signals. No two buttons may be pressed at the same time. The empty buttons cannot be pressed. The keypad decoder you need to design will convert the button press into a $$\mathrm{BCD}$$ number. A circuit that decodes the keys pressed in the keypad into a BCD digit to obtain the average sleep duration,