Multiply Binary Numbers with Hex Keypad

[kadaj6]

hello,

I'm trying to design a "calculator" that multiplies two four bit binary numbers without using any type of programming or microcontrollers. so far it can multiply and show me the answer, I am using a hex keypad, and ascii display. but I am having trouble since i have to actually show "5x5=25" since x equals 1010 in binary and = equals 1101 in binary. everytime i press those numbers its going to use them to multiply with the number i input before... I am stuck and frustrated... any help would be nice.

 

[perplexabot]

hello,

I'm trying to design a "calculator" that multiplies two four bit binary numbers without using any type of programming or microcontrollers. so far it can multiply and show me the answer, I am using a hex keypad, and ascii display. but I am having trouble since i have to actually show "5x5=25" since x equals 1010 in binary and = equals 1101 in binary. everytime i press those numbers its going to use them to multiply with the number i input before... I am stuck and frustrated... any help would be nice.

Hello.
I am not so sure how you are implementing this design but why not have it automatically print the "x" sign after you enter the first number and automatically enter "=" after you enter the second number? Is this an option?

 

[kadaj6]

is that idk where to send the "1010" value when i press it... that's what i have in my head lol but don't know how to implement

 

[perplexabot]

hello,

I'm trying to design a "calculator" that multiplies two four bit binary numbers without using any type of programming or microcontrollers.

What do you mean by that? How are you going to implement this design without programming and a microcontroller? Like strait from the keypad to the LCD?

 

[berkeman]

hello,

I'm trying to design a "calculator" that multiplies two four bit binary numbers without using any type of programming or microcontrollers. so far it can multiply and show me the answer, I am using a hex keypad, and ascii display. but I am having trouble since i have to actually show "5x5=25" since x equals 1010 in binary and = equals 1101 in binary. everytime i press those numbers its going to use them to multiply with the number i input before... I am stuck and frustrated... any help would be nice.

It sounds like you need to throw an error if the user types anything other than Y x Z =.

If they try to type a 2-digit number like YY x ZZ = just display ERROR or something similar. Or EEEE.

 

[kadaj6]

3x4 Keypad

Homework Statement

ok, so I am designing a basic multiplication calculator using only logic gates registers buffers and ram, and any other chip that doesn't involve programming or microcontrollers. i have the rest of the circuit done all I need is the implementation of a keypad that gives me the output of the number I am pressing in binary(yes i know there is a 3x4 keypad alreade but the profesor wants us to implement it)

The Attempt at a Solution

this is my attempt so far, I have no idea what else to do. maybe someone can help me with this

Thanks in advance! :D

 

[berkeman]

(Two threads merged...)

 

[berkeman]

Homework Statement

ok, so I am designing a basic multiplication calculator using only logic gates registers buffers and ram, and any other chip that doesn't involve programming or microcontrollers. i have the rest of the circuit done all I need is the implementation of a keypad that gives me the output of the number I am pressing in binary(yes i know there is a 3x4 keypad alreade but the profesor wants us to implement it)

The Attempt at a Solution

View attachment 64646



this is my attempt so far, I have no idea what else to do. maybe someone can help me with this

Thanks in advance! :D

You need to post your state diagram and truth table(s) before we can be of much help...