by David A. Mellis
modified 8 Feb 2010
by Paul Stoffregen
+ modified by eaman
This example code is in the public domain.
// constants won't change. Used here to
// set pin numbers:
-const int ledPin = 13; // the number of the LED pin
+const int ledPin = 13;
// Variables will change:
int ledState = LOW; // ledState used to set the LED
// 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 interval = 1000; // interval at which to blink (milliseconds)
+const long interval = 1000; // interval at which to blink (milliseconds)
void setup() {
// set the digital pin as output:
// 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 - previousMillis > interval) {
- // save the last time you blinked the LED
- previousMillis = currentMillis;
+ if(millis() - previousMillis > interval) {
+ // Aggiorniamo il contatore previousMillis
+ previousMillis = millis();
// if the LED is off turn it on and vice-versa:
if (ledState == LOW)
ledState = HIGH;
else
ledState = LOW;
+ // e' possibile semplificare questa operazione?
+ // Hint: lo stato del LED e' binario: ha solo due stati possibili.
// set the LED with the ledState of the variable:
digitalWrite(ledPin, ledState);
/* Domande
1. Aggioungere un LED che brilli ogni 500ms
- 2. E' possibile cambiare gli intervalli dei due LED?
- */
+ 2. E' ora agevole cambiare gli intervalli dei due LED?
+ Modificare gli intervalli dei due led (es 500ms - 320ms)
+ */