Help with ECE lab...

[iamtrout]

Say that you have 75 ( 01001011 ) and you want to display the number on two displays. Each display can only display a single digit, so you have to send a "7" ( 0111 ) to one display and a "5" ( 0101 ) to the other display for the entire number 75 to be displayed.

How do you get the binary for 7 and 5 from 75?

 

[smack Down]

Use teh first 4 bits for the 7 and the last four bits for the 5

 

[Bassyhead]

Originally posted by: smack Down
Use teh first 4 bits for the 7 and the last four bits for the 5

That would work if the number (75) were hexadecimal and the upper nibble was "7" and the lower nibble was "5".

Edit: If you do it the way you suggest, you'll get 4 and 11.

 

[Bassyhead]

OP: Divide the 75 by 10 to get the "7". Multiply the "7" by 10, subtract that from the original 75 and you'll be left with the "5".

 

[iamtrout]

Originally posted by: Bassyhead
OP: Divide the 75 by 10 to get the "7". Multiply the "7" by 10, subtract that from the original 75 and you'll be left with the "5".

So I would need some form of ALU in my circuit?

 

[slpaulson]

Is it going to be 75 every time, or do you have to be able to handle any number less than 100?

 

[Bassyhead]

You're going to need some sort of arithmetic in order to do what you want. I'm assuming the OP is only dealing with 2 digit numbers (00 to 99) as each display seems to only be capable of displaying a single digit. The example I gave will work from 0-99, though someone else may have a simpler solution.

 

[NutBucket]

What are you using to do this?

FPGA?

Discrete Chips?

 

[iamtrout]

Nevermind all. I figured it out. We were supposed to use a ROM and basically program in all the input combinations and its outputs. Too bad our prof never told us what a ROM was :roll:

 

[NutBucket]

LOL!!! Nice.

 

[ColdFusion718]

lol I remember taking a class like that, 2 days before the project is due, my dumbass professor says "oh by the way, I forgot to tell you guys that you can use ROMs on this assignment." People were doing all sorts of crazy sh!t before he gave us this piece of info. A lot of the stuff I've seen were pure ingenuity. Proves to show that to see who the smart/invent students are in an engineering class, you give them a dumb teacher who leaves out information.