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I have a code that will control up to a 56 column display, if you wish to use it. Contact me at firstname.lastname@example.org
Sorry, not really sure how to do it, but it might be possible.
It might be possible that you have your rows connected in reverse order. that is where I would start looking.
byte latchPin = 53; //10 (SS) -> 53byte clockPin = 52; //13 (SCK) -> 52byte dataPin = 51; //11 (MOSI) -> 51byte latchPinPORTB = 0; // 53 -> PB0byte clockPinPORTB = 1; // 52 -> PB1byte dataPinPORTB = 2; // 51 -> PB2
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Hi, I have built Syst3mX's project and his code works fine as is for a 24x6 matrix. I am willing to help you if I can. If you would like my help private message me.
The transistors amplify the output voltage from the decade counter, and also acts like a switch, when there is no current at the base, there is little to no current flowing from the collector and the emitter. Without them all you will get is a column of six LED's scrolling across the matrix, no defined characters. You can find all kinds of information on how transistors work.
There might be a way, but you will still be using a PWM pin for the output, to control the shift register. As the code being used controls the Arduino.
When making these nuts do not use stainless steel, as I had a co-worker who almost lost his finger because he broke it playing basketball and in order to set the finger the ring needed to come off, but due to the swelling it would not slide off.. The doctors had a terrible time trying to cut the ring off, and almost decided to take his finger off instead. So remember not to use too hard of a material.
I can give you a serial input display program.
All of these variables below need to be changed to 10.  r<6 p<6 y<6 i == 6 h<6 k<6
Could you send me some photos, of your shift registers, the decade counter, and your Arduino hookup, I will be glad to see if I can help you. My email is email@example.com
I am afraid his code is limited to 24 columns, however I have been able to modify, his code to work with more shift registers. Send an email to firstname.lastname@example.org
Make a 24X6 LED matrix
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