LEZIONE n° 2 – SENSORI
La lezione è sui sensori e sulla loro gestione. I primi sensori che saranno gestiti sono i LED.
Per provare a fare le modifiche proposte copiare il listato (colorato in rosso) ed incollarlo in un editor di solo testo [Notepad ad esempio]
listato programma esempio numero 1:
/* Blink
Turns on and off a light emitting diode(LED) connected to a digital pin.
The circuit:
* LED attached from pin 13 to ground.
* Note: on most Arduinos, there is already an LED on the board
that’s attached to pin 13, so no hardware is needed for this example.
*/
// set pin numbers:
const int ledPin = 13; // the number of the LED pin
// Variables will change:
int ledState = LOW; // ledState used to set the LED
void setup() {
pinMode(ledPin, OUTPUT); // set the digital pin as output:
}
void loop() // here is where you’d put code that needs to be running all the time.
{ // 1000 egual 1 seconds
unsigned long tempo = 250;
digitalWrite(ledPin, HIGH);
delay(tempo);
digitalWrite(ledPin, LOW);
delay(tempo);
}
Modifiche proposte:
cambiare il tempo di accensione
listato programma esempio numero 2:
/* Blink
Turns on and off a light emitting diode(LED) connected to a digital pin.
The circuit:
* LED attached from pin 13 to ground.
* Note: on most Arduinos, there is already an LED on the board
that’s attached to pin 13, so no hardware is needed for this example.
*/
// set pin numbers:
const int buttonPin = 2; // the number of the pushbutton pin
const int ledPin = 13; // the number of the LED pin
// Variables will change:
int ledState = LOW; // ledState used to set the LED
int buttonState = 0; // variable for reading the pushbutton status
void setup() {
pinMode(ledPin, OUTPUT); // set the digital pin as output:
pinMode(buttonPin, INPUT); // initialize the pushbutton pin as an input:
}
void loop() // here is where you’d put code that needs to be running all the time.
{ // 1000 egual 1 seconds
// read the state of the pushbutton value:
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) { // check if the pushbutton is pressed.
// turn LED on:
digitalWrite(ledPin, HIGH); // if it is, the buttonState is HIGH:
}
else {
// turn LED off:
digitalWrite(ledPin, LOW);
}
}
Modifiche proposte:
cambiare il pin di controllo
lasciare il led acceso in un caso farlo “lampeggiare” nell’altro
controllare il led da DUE pin
di seguito le slide della lezione
(67)
