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LED 74595

 
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horizontechno
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LED 74595
PostPosted: Sun Jul 23, 2006 7:47 pm     Reply with quote
Hi !

I looking the good way to control the brightness on each LED conected to the output of 74595 ? individualy ?

I need to control 4 x 74595 ( 32 LED )

Thanks

Alain Tanguay
Guest
PostPosted: Sun Jul 23, 2006 8:33 pm     Reply with quote
you need to use PWM.. pulse width modulation

the outputs can only be on or off at a time, so the trick is to let tem off for some time and on.. the ratio between on/(off+on) is called duty cicle, and defines the bright... of course toff+ton must be a very short time, like 1/60 sec.
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