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Electronic circuit schematic about number keyboard and seven segment?

I want to diy an electronic expriment. It’s about number keyboard and seven segment. If you press ‘0~9′ or ‘.’ ,it will show number or ‘.’ on the seven segment, and pressng * will clear the seven segment. Now, I don’t know how to design the circuit diagram, please help me.
What i want to do is not using computer, but on electronic board, which often used on experiment.

OK u have to ask this Q in engineering part

anyway what i understand from u that u want press on 0—9 on keyboard and it appear on the 7 segment

so u must have an interface with ur hardware from PC .. u can use parallel port, serial port, USP and blue tooth

so first u have to make interface by and programming language and u have two ways

to make design to numbers and when press by mouse u output on the parallel port the number or by making if condition

like

if(key == 5)
outport(0×378,101)

and that’s for each key put u must read from key board that u must identify that when u press on five it = five i think u understand me

that’s idea about software

about hardware

just take the output of the parallel port

0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
take it on decoder to 7 segment and it will work

put u have to make good software .. u can use matlab,porland c,C# … but i prefer matlab

i wish i could help u

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