X-Git-Url: http://git.piffa.net/web?p=sketchbook_andrea;a=blobdiff_plain;f=basic%2Fpwm%2Fpwm_0_stati%2Fpwm_0_stati.ino;fp=basic%2Fpwm%2Fpwm_0_stati%2Fpwm_0_stati.ino;h=7842b6cc2d981061b2b55c5e91b417e100cd2fac;hp=3863c4a8a3ad19ec4c3351c2962396b7a8e2033d;hb=3186569da93182e73fa3ea99beb8c9ea53a6ba8a;hpb=7235b2bd6847d70a486c4941ed3d4fc3186d02de

diff --git a/basic/pwm/pwm_0_stati/pwm_0_stati.ino b/basic/pwm/pwm_0_stati/pwm_0_stati.ino
index 3863c4a..7842b6c 100644
--- a/basic/pwm/pwm_0_stati/pwm_0_stati.ino
+++ b/basic/pwm/pwm_0_stati/pwm_0_stati.ino
@@ -3,11 +3,13 @@
  
    PWM per un LED: impostare i valori di luminosita' di un LED.
    4 stati di luminosita' per un LED collegato a un PIN PWM
+
+   Il PWM del 328p simula un convertitore digitale -> analogico
+   con profondita' di 8 bit: 256 valori da 0 - 255 .
    
  */
 
 const int led  = 9   ;     // Il pin ~9 e' abilitato al PWM
-byte brightness = 255;  // Valore iniziale per il PWM del LED
 const int pausa = 2000; // Pausa tra uno stato e l'altro
 
 void setup()  { 
@@ -16,22 +18,22 @@ void setup()  {
 
 void loop()  { 
   // OUTPUT al 100% : 255
-  analogWrite(led, brightness) ; 
+  analogWrite(led, 255) ; 
   delay(pausa);
 
   // OUTPUT al 75% : 191
-  analogWrite(led, brightness * 0.75) ; 
+  analogWrite(led, 191) ; 
   delay(pausa);
   
   // OUTPUT al 50% : 127
-  analogWrite(led, brightness * 0.5) ; 
+  analogWrite(led, 127) ; 
   delay(pausa);
   
   // OUTPUT al 25%: 63
-  analogWrite(led, brightness * 0.25 ) ; 
+  analogWrite(led, 63 ) ; 
   delay(pausa);
 
   // OUTPUT al 0%
-  analogWrite(led, brightness * 0) ;
+  analogWrite(led, 0) ;
   delay(pausa);
 }