555 timer/7 segment display/1 second intervals

Thread Starter

fitzyafcb

Joined Feb 20, 2016
4
Hi I could really do with some help please.

I am a first year part time HNC student with very little experience in electronics and using Proteus, but i'm getting by so far.

My next assignment task is to apply a 555 timer to my working 16 character word circuit displayed on the 7 segment display. The timer needs to run the display at 1 second intervals. I am fairly confident with my resistor/capacitor values to achieve this, but I just can't get it right to display each of the 16 character letters. It's currently shows only the last letter!. What have I done wrong? What's missing? Any help would be much appreciated. thanks in advance.

upload_2016-2-20_13-18-15.png
upload_2016-2-20_13-18-42.png
 

Thread Starter

fitzyafcb

Joined Feb 20, 2016
4
Thanks for your reply but I have tried what you have suggested and it still doesn't seem to work. I can get the first and last characters to display now but not the rest
 

bertus

Joined Apr 5, 2008
20,564
Hello,

Should there be a counter that goes through the 16 numbers?
Now A through D can only be 0 or 1 dependend on the 555 state and will all have the same value.

Bertus
 

Thread Starter

fitzyafcb

Joined Feb 20, 2016
4
ah yes finally i've cracked it!!! i think
i've used a 4-input JK flip flop ( i think that's what it's called!!) lmao
It all looks good to me, all the characters are displaying.
wow that feels good!

many thanks
 
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