I attach a circuit where I plan a raceboard to show time with 6 diggits und for place 1-3 and actual time.
I plan a daisy-chain of 24 shift register where 4x6 digit to show these 4 times.
In my first step i have a daisy-chain with 24x 74HC595. From uno ich go with SPI trough the register.
Here is a video where you can see my first step.
with 12 of them all was ok. But after that I have the problem that I get errors.
You can see see this in the video.
So the plan was a buffer between the uno and the rigister.
Here ist my circuit with a buffer in the attachment
Today I test it but nothing is going on.
I put the ss-bus from uno in the input of the buffer. From Output I go two the first register.
But nothing is going on. The clock I set down.
Hope anybody can help me.