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ABCD display on 7-Segment

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kasamiko

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Hi,

Anybody has and idea to display character A,B,C,D on 7-segment with 4 individual switches for each character? I'll be using PIC16F84 or 16F628..


Something like the attached image below..


51_1341906457.png



Any idea will be appreciated.


TIA
 

I hate to ask the usual question but is this a college/university assignment? At any rate, you can easily look up the information you need through Google. You'll learn far more finding the information and working it yourself, too.
 

I agree with TonyM.

I'll drop a hint though - forget "abcd" and think in terms of segements on and segments off, it's a simple look up table to convert the input signals to segment control signals.

Brian.
 
no..

my grade school teacher ask me to built this for school quiz bee...;D


BR
 

kasamiko said:
no..

my grade school teacher ask me to built this for school quiz bee...;D

BR
Click to expand...

I'm sure he did it in the hope that you'll learn from the exercise, not just copy someone else's thinking then. Not trying to be unkind :)

Connect the PIC to the 7-seg using direct drive, not multiplexed. You'll find plenty on driving a 7-seg on the internet. Should use a resistor per segment. Choose a resistor value that limits each segment's current to 2mA and try that.

Draw a 7-segment pattern on paper. Then work out which segments should be lit to make each pattern of A, B, C and D. Your PIC must drive these patterns.

Find out and understand what a priority encoder is in digital logic. Consider where you might implement such a function in your software.

The very best of luck, this should be a fun project for you...
 
Other hints:

Make "A" uppercase
Make "b" and "d" lowercase
"C" can be upper- or lowercase.

This is for easy reading. :)
 
TonyM said:
I'm sure he did it in the hope that you'll learn from the exercise, not just copy someone else's thinking then. Not trying to be unkind :)

Connect the PIC to the 7-seg using direct drive, not multiplexed. You'll find plenty on driving a 7-seg on the internet. Should use a resistor per segment. Choose a resistor value that limits each segment's current to 2mA and try that.

Draw a 7-segment pattern on paper. Then work out which segments should be lit to make each pattern of A, B, C and D. Your PIC must drive these patterns.

Find out and understand what a priority encoder is in digital logic. Consider where you might implement such a function in your software.

The very best of luck, this should be a fun project for you...
Click to expand...


Oh my G0d! I'm already 40 yrs old and my former teacher upon seeing I've been playing with LED's ask me if I can help them make this circuit...


`
 

Spare a thought for those of use who can't even remember as far back as being 40 and still have to work on these puzzles !!!

Brian.
 

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