Your assignment:

Design a simple addition calculator that

$-$ accepts two unsigned $4-$bit inputs $($or $8$ bits total$),$

$-$ performs addition on the inputs, and

$-$ outputs the sum on an LED display that can show only digits $0$ through $9$ and letter E$.($If the sum is greater than $9,$ display E $($error$)$ on LED.$),$ i$.$e$.,$ the LED display may have $11$ possible outputs that are shown below.

Use logisim

A basic design diagram for the device is shown below.

Your report should include

$-$ all necessary truth tables$/$Boolean expressions,

$-$ a logic circuit with logic gates, and

$-$ your narrative explaining what you have done in this assignment and what were the challenges you have faced while doing it