Free Project - 245 LED Display

[precision]

I build this circuit with only one 5X7 led display ( Col 1,2,3,4,5 ), But not working. Is it necessary to built all 7 display ?

[T.Jackson]

I build this circuit with only one 5X7 led display ( Col 1,2,3,4,5 ), But not working. Is it necessary to built all 7 display ?

Can you be a bit more specific - what exactly have you done & what's not working?

As is, without great modification, it would be next to useless with just 35 LEDs.

[precision]

My controller circuit is same, But i connect only one 5x7 dot matrix display to IC3 ( cd4017)

[T.Jackson]

My controller circuit is same, But i connect only one 5x7 dot matrix display to IC3 ( cd4017)

I see. Are you able to successfully upload a message from the Windows software to the EEPROM? If so, do any of the LEDs come on?

(You need to describe exact symptoms - theoretically, because each character is actually 5x7, I guess the circuit should show a quick flicker of single characters on 35 LEDs. There would be noticeable pauses in between. In other words, yes I believe it should do something with just 35 LEDs.

[precision]

How i confirm that i successfully upload a message from the Windows software to the EEPROM?

I also using 24c04 instead of 24c256,

will you upload eny video of working display ?

Are display something look like This video ?

[T.Jackson]

How i confirm that i successfully upload a message from the Windows software to the EEPROM?

I also using 24c04 instead of 24c256,

will you upload eny video of working display ?

Are display something look like This video ?

Do you realize that the 24c04 is technically different to the 24c256? You can't just whack in the 24c04 and hope for the best - it won't work without modifying the software. The 24c04 is cumbersome to work with compared to the 24c256. Byte sized addressing and bank switching complicate a relatively simple need.

[Dazheng]

Greetings Trent,
I am now starting to build your project, I'm on stage one building 4017 sequencer. I have some question, is it possible to extend it for more characters, as of now it has seven character i want to extend it for more characters. can you please guide or give some example on how to do it. Thanks in advance....