2 8x8 matrix scrooling text, how to make the connection?

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nodoubtman
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2 8x8 matrix scrooling text, how to make the connection?

Post by nodoubtman » Tue Aug 28, 2012 10:01 am

Hi all! I would like to complete a great project, which is : http://embedded-lab.com/blog/?p=2661#more-2661
i'm wondering where are the row and the collumn on the matrix 24 pins?

thank you!
marC:)

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brad
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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by brad » Fri Aug 31, 2012 8:39 am

Have a look here:

viewtopic.php?f=2&t=250

bitfogav explains it extremely well :)

nodoubtman
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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by nodoubtman » Sat Oct 13, 2012 12:54 am

brad wrote:Have a look here:

viewtopic.php?f=2&t=250

bitfogav explains it extremely well :)
According to the datasheet :
Image
and this image :
Image
i would like to know from where i count the pin number on the matrix?
can you point out the pin number of the second image according to the datasheet?

thanks so much!
marC:)

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brad
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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by brad » Sat Oct 13, 2012 7:41 am

Looking at bitfogavs image (i.e. the text is on the bottom):

24 23 22 21 20 19 18 17 16 15 14 13







01 02 03 04 05 06 07 08 09 10 11 12

It's the same as reading a chip :)

nodoubtman
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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by nodoubtman » Sat Oct 13, 2012 11:17 am

brad wrote:Looking at bitfogavs image (i.e. the text is on the bottom):

24 23 22 21 20 19 18 17 16 15 14 13







01 02 03 04 05 06 07 08 09 10 11 12

It's the same as reading a chip :)
oh that's why it didnt work properly..

thank you again!
marC:)

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brad
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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by brad » Sun Oct 14, 2012 7:57 am

No problem :)

nodoubtman
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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by nodoubtman » Fri Nov 23, 2012 10:09 am

brad wrote:No problem :)
in this project brad : http://embedded-lab.com/blog/?p=2661#more-2661

does he use same type of matrix for car race game??
CA??
will it work with these matrix?

thank you!
marC:)

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brad
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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by brad » Sat Nov 24, 2012 7:22 am

The screens that I use will work with that project. That project only has red LED matrix displays so all you need to do is connect the orange wires (as shown in bitfogavs image a few posts back) to the ULN2803 (in the image on the site link you provided)

Then you connect the yellow wires (in bitfogavs image) to the 74595 chips (as shown in your image)

And that's it! you just leave out the green connections.

nodoubtman
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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by nodoubtman » Mon Apr 15, 2013 1:12 am

brad wrote:The screens that I use will work with that project. That project only has red LED matrix displays so all you need to do is connect the orange wires (as shown in bitfogavs image a few posts back) to the ULN2803 (in the image on the site link you provided)

Then you connect the yellow wires (in bitfogavs image) to the 74595 chips (as shown in your image)

And that's it! you just leave out the green connections.
The ULN2803 is used for the commun cathode dot matrix? so i have the commun anode, that wouldn't work ?

thank you!
marC:)

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Re: 2 8x8 matrix scrooling text, how to make the connection?

Post by brad » Mon Apr 15, 2013 6:19 am

Unfortunately it won't work.

You will either need to connect up your own individual transistors to drive them or perhaps there is a darlington array that could be connected to a common anode matrix, although I have not seen / searched for one.

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