Brads Electronic Projects Forum

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:)

Have a look here:

viewtopic.php?f=2&t=250

bitfogav explains it extremely well

brad wrote:Have a look here:

viewtopic.php?f=2&t=250

bitfogav explains it extremely well

According to the datasheet :

and this 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:)

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

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:)

No problem

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:)

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.

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:)

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.