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How to make a moving message dissplay using 4015 shift register

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I suppose you would need a way to load the characters into the parallel 4015s (maybe a micro controller), then clock them through the string.
A better way would be to use a micro controller with plenty of in/out pins and clock it in software. Multiplex the I/O pins to light the display.
Use more than 1 micro if you need more outputs.
 
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This is one way of doing it
 

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Look up charlieplexing, with this you can control 240 leds with 16 pins
 
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