hi,

i intend to use a 7x5 matrix for each charaster while the complete board will have at least 32 or 48 columns.
I meant 32 columns not 32 characters

Good, so explain me: how much matrixes 7x5 should you use to obtain 32 or 48 columns? Both 32 and 48 are not divided with 5 without remander...

About the program and explanation, could U shed more light on it?

Hmm, maybe it helps. Next device I have done three years ago has eight 8x5 Dot Matrixes:

They are controlled with eight 74AC164 + ULN 2803:


Five columns are controlled with power transistors.

By the way, have you an experience with column/row multiplexing at all?


Regards,
Oleg