-/* Blink without Delay
+/* Blink without Delay: Refactoring
- Soluzione
+ Blink con funzione
- 3. Provare a isolare il codice per accendere ogni singolo led in una funzione:
- Quali variabili determinano il comportamento del LED?
- Sono globali o locali?
-
- */
+ Soluzione: 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?
-// constants won't change. Used here to
-// set pin numbers:
+Variabili: http://www.maffucci.it/2011/12/15/appunti-di-programmazione-su-arduino-variabili/
+
+ */
/////////////
// First LED
-int ledA = 13; // the number of the LED pin
-// Variables will change:
-int ledStateA = LOW; // ledState used to set the LED
-long previousMillisA = 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)
+const int ledA = 13; // the number of the LED pin
+int ledStateA = LOW; // ledState used to set the LED
+long previousMillisA = 0; // will store last time LED was updated
+long intervalA = 1000; // interval at which to blink (milliseconds)
+void lightLedA () ;
//////////////
-// Second LED
-int ledB = 12; //Secondo LED
-int ledStateB = LOW; // ledState used to set the LED
-long previousMillisB = 0; // will store last time LED was updated
-long intervalB = 500; // interval at which to blink (milliseconds)
+// Second LED
+// Ora con meno variabili globali utilizzando static (vedi corpo della funzione)
+const int ledB = 12; //Secondo LED
+long previousMillisB = 0; // will store last time LED was updated
+ // interval at which to blink (milliseconds)
+void lightLedB () ;
void setup() {
}
-// Funzioni
+// Funzioni:
void lightLedA () {
- if(millis() - previousMillisA > intervalA) {
+ if (millis() - previousMillisA >= intervalA) {
// save the last time you blinked the LED
- previousMillisA = millis();
+ previousMillisA += intervalA;
// if the LED is off turn it on and vice-versa:
- if (ledStateA == LOW)
- ledStateA = HIGH;
- else
- ledStateA = LOW;
+ ledStateA = !ledStateA ;
// set the LED with the ledState of the variable:
digitalWrite(ledA, ledStateA);
}
}
void lightLedB () {
- if(millis() - previousMillisB > intervalB) {
+ long intervalB = 500;
+ static int ledStateB ; // https://www.arduino.cc/en/Reference/Static
+ if (millis() - previousMillisB >= intervalB) {
// save the last time you blinked the LED
- previousMillisB = millis();
+ previousMillisB += intervalB ;
// if the LED is off turn it on and vice-versa:
- if (ledStateB == LOW)
- ledStateB = HIGH;
- else
- ledStateB = LOW;
+ ledStateB = !ledStateB;
// set the LED with the ledState of the variable:
digitalWrite(ledB, ledStateB);
}
/* Domande
1. Modificare le funzioni in modo che accettino come parametro
- l'intervallo di lampeggio.
-
+ l'intervallo di lampeggio.
+
*/
+