State machine e blinks con millis()

[sketchbook_andrea] / multitasking / BlinkWithoutDelay_2_led / BlinkWithoutDelay_2_led.ino

diff --git a/multitasking/BlinkWithoutDelay_2_led/BlinkWithoutDelay_2_led.ino b/multitasking/BlinkWithoutDelay_2_led/BlinkWithoutDelay_2_led.ino
index fa2c35c7d651332f404ea0b0a72549677540eec5..2100ead96aaba26397c4f252881e6c134b79eac6 100644 (file)
--- a/multitasking/BlinkWithoutDelay_2_led/BlinkWithoutDelay_2_led.ino
+++ b/multitasking/BlinkWithoutDelay_2_led/BlinkWithoutDelay_2_led.ino
@@ -1,4 +1,4 @@
-/* Blink without Delay
+/* Blink without Delay - due led
  
  Turns on and off a light emitting diode(LED) connected to a digital  
  pin, without using the delay() function.  This means that other code
@@ -14,6 +14,7 @@
  by David A. Mellis
  modified 8 Feb 2010
  by Paul Stoffregen
+ modified by eaman
  
  This example code is in the public domain.
  
@@ -23,20 +24,20 @@
 
 // constants won't change. Used here to 
 // set pin numbers:
-const int ledA =  13;      // the number of the LED pin
-int ledB = 12; //Secondo LED
+const int ledA = 13;      // Primo LED
+const int ledB = 12;      // Secondo LED
 
-// Variables will change:
+// Variabbili di stato
 int ledStateA = LOW;             // ledState used to set the LED
 int ledStateB = LOW;             // ledState used to set the LED
-
+              
 long previousMillisA = 0;        // will store last time LED was updated
 long previousMillisB = 0;        // will store last time LED was updated
 
 // the follow variables is a long because the time, measured in miliseconds,
 // will quickly become a bigger number than can be stored in an int.
 long intervalA = 1000;           // interval at which to blink (milliseconds)
-long intervalB = 500;           // interval at which to blink (milliseconds)
+long intervalB = 500;            // interval at which to blink (milliseconds)
 
 void setup() {
   // set the digital pin as output:
@@ -46,17 +47,10 @@ void setup() {
 
 void loop()
 {
-  // here is where you'd put code that needs to be running all the time.
-
-  // check to see if it's time to blink the LED; that is, if the 
-  // difference between the current time and last time you blinked 
-  // the LED is bigger than the interval at which you want to 
-  // blink the LED.
-  unsigned long currentMillis = millis();
-
-  if(currentMillis - previousMillisA > intervalA) {
+// Primo LED
+  if (millis() > previousMillisA + intervalA) {
     // save the last time you blinked the LED 
-    previousMillisA = currentMillis;   
+    previousMillisA = millis();   
 
     // if the LED is off turn it on and vice-versa:
     if (ledStateA == LOW)
@@ -67,9 +61,10 @@ void loop()
     digitalWrite(ledA, ledStateA);
   }
   
-    if(currentMillis - previousMillisB > intervalB) {
+// Secondo LED
+    if (millis() > previousMillisB + intervalB) {
     // save the last time you blinked the LED 
-    previousMillisB = currentMillis;   
+    previousMillisB = millis();   
 
     // if the LED is off turn it on and vice-versa:
     if (ledStateB == LOW)
@@ -82,9 +77,11 @@ void loop()
 }
 
 /* Domande
- 2. Inserire un secondo LED con intervallo 500ms
- 1. Trasformare il codice utilizzato in una State Machine
- 
+ 1. Provare a isolare il codice per accendere ogni singolo led in una funzione:
+    - Quali variabili determinano il comportamento del LED?
+    - Come cambiano durante il corso dello script?
+    - Sono globali o locali? 
+    - Quali parti vanno eseguite una sola volta e quali a ogni esecuzione?
  */