From 8bbff1c558947ca1ff1733240827c87494ff4fd5 Mon Sep 17 00:00:00 2001
From: Andrea Manni <andrea@piffa.net>
Date: Mon, 23 Mar 2015 17:40:34 +0100
Subject: [PATCH] PWM: errata and states

---
 .../button_presses_count_down_5.ino           |  7 ++++-
 .../buttons/button_state_3/button_state_3.ino |  2 +-
 basic/pwm/pwm_0_stati/pwm_0_stati.ino         | 26 +++++++++++++++++++
 .../pwm/pwm_1_while_byte/pwm_1_while_byte.ino |  4 +--
 basic/pwm/pwm_2_for_loop/pwm_2_for_loop.ino   |  6 ++---
 .../pwm_3_fade_reverser.ino                   |  2 +-
 6 files changed, 39 insertions(+), 8 deletions(-)
 create mode 100644 basic/pwm/pwm_0_stati/pwm_0_stati.ino

diff --git a/basic/buttons/button_presses_count_down_5/button_presses_count_down_5.ino b/basic/buttons/button_presses_count_down_5/button_presses_count_down_5.ino
index 1d60d73..2a26de6 100644
--- a/basic/buttons/button_presses_count_down_5/button_presses_count_down_5.ino
+++ b/basic/buttons/button_presses_count_down_5/button_presses_count_down_5.ino
@@ -1,5 +1,10 @@
 /*
- *  Alternating switch
+ *  Contatore di input
+
+    Il programma rileva la pressione del bottone e
+    riduce un contatore ad ogni pressione,
+    passando dallo stato iniziale a un secondo stato finale
+    dopo 10 iterazioni.
  */
 
 int switchPin = 2;              // switch is connected to pin 2
diff --git a/basic/buttons/button_state_3/button_state_3.ino b/basic/buttons/button_state_3/button_state_3.ino
index c008ff1..83b274f 100644
--- a/basic/buttons/button_state_3/button_state_3.ino
+++ b/basic/buttons/button_state_3/button_state_3.ino
@@ -19,7 +19,7 @@ void setup() {
 
 void loop(){
   statoAttuale = digitalRead(switchPin);      // Legge lo stato del bottone e lo resistra in val
-  // delay(20)                                // riduce l'effetto bounce
+   delay(20)                                // riduce l'effetto bounce
   if (statoAttuale != ultimoStato) {          // lo stato del bottone e' cambiato
     if (statoAttuale == HIGH) {               // il bottone e' stato premuto
       Serial.println("Bottone premuto");
diff --git a/basic/pwm/pwm_0_stati/pwm_0_stati.ino b/basic/pwm/pwm_0_stati/pwm_0_stati.ino
new file mode 100644
index 0000000..f2c78a5
--- /dev/null
+++ b/basic/pwm/pwm_0_stati/pwm_0_stati.ino
@@ -0,0 +1,26 @@
+/*
+   PWM demo
+ 
+   PWM per un LED: impostare i valori di luminosita' di un LED.
+ */
+
+int led  = 9   ;     // Il pin ~9 e' abilitato al PWM
+byte brightness = 0;  // Valore iniziale per il PWM del LED
+int pausa = 2000; // Pausa tra uno stato e l'altro
+
+void setup()  { 
+  pinMode(led, OUTPUT); // Il PIN nove va dichiarato come un OUTPUT
+} 
+
+void loop()  { 
+  analogWrite(led, 0) ; // spento
+  delay(pausa);
+  analogWrite(led, 63) ;   // 1/4
+  delay(pausa);
+  analogWrite(led, 127) ;  // 1/2
+  delay(pausa);
+  analogWrite(led, 191) ;  // 3/4
+  delay(pausa);
+  analogWrite(led, 254) ;  // Full light
+  delay(pausa);
+}
diff --git a/basic/pwm/pwm_1_while_byte/pwm_1_while_byte.ino b/basic/pwm/pwm_1_while_byte/pwm_1_while_byte.ino
index de1a994..cf5451a 100644
--- a/basic/pwm/pwm_1_while_byte/pwm_1_while_byte.ino
+++ b/basic/pwm/pwm_1_while_byte/pwm_1_while_byte.ino
@@ -1,4 +1,4 @@
-/*pwm_
+/*
    Fade
  
    PWM per un LED: aumentare progressivamente la luminosita'.
@@ -24,4 +24,4 @@ void loop()  {
 1. Come fare a invertire la dissolvenza diminuendo la luminosita'?
 2. Provare a far salire e poi scendere la luminosita'
 
-
+*/
diff --git a/basic/pwm/pwm_2_for_loop/pwm_2_for_loop.ino b/basic/pwm/pwm_2_for_loop/pwm_2_for_loop.ino
index 12e6e78..d389ad1 100644
--- a/basic/pwm/pwm_2_for_loop/pwm_2_for_loop.ino
+++ b/basic/pwm/pwm_2_for_loop/pwm_2_for_loop.ino
@@ -16,7 +16,7 @@ void setup()
 
 void loop()
 {
-  for ( i = 0; i < 255 ; i++) { // Operatore ternario, 3 argomenti:
+  for (int i = 0; i < 255 ; i++) { // Operatore ternario, 3 argomenti:
   /* 1. definizione iteratore
      2. limite iteratore
      3. incremento operatore
@@ -25,9 +25,9 @@ void loop()
     delay(5 );
   }
   // Ora l'inverso
-  for ( c = 255; c > 0 ; c--) {
+  for (int c = 255; c > 0 ; c--) {
     analogWrite(led, c) ;
-    delay(5 );
+    delay(5);
   }
 }
 
diff --git a/basic/pwm/pwm_3_fade_reverser/pwm_3_fade_reverser.ino b/basic/pwm/pwm_3_fade_reverser/pwm_3_fade_reverser.ino
index 54cbb43..5112951 100644
--- a/basic/pwm/pwm_3_fade_reverser/pwm_3_fade_reverser.ino
+++ b/basic/pwm/pwm_3_fade_reverser/pwm_3_fade_reverser.ino
@@ -8,7 +8,7 @@ Fade
  */
 
 int led = 9;
-int brightness = 0;
+int brightness = 0; // this two could be bytes as well
 int fadeAmount = 5;
 // the pin that the LED is attached to
 // how bright the LED is
-- 
2.39.2