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//HC RS04 Sensore ultrasuoni
const int triggerPort = 9;
const int echoPort = 10;
const int led = 3;
void setup() {
pinMode(triggerPort, OUTPUT);
pinMode(echoPort, INPUT);
pinMode(led, OUTPUT);
Serial.begin(9600);
}
void loop() {
digitalWrite( triggerPort, LOW );
//invia un impulso di 10microsec su trigger
digitalWrite( triggerPort, HIGH );
delayMicroseconds( 10 );
digitalWrite( triggerPort, LOW );
long durata = pulseIn( echoPort, HIGH );
long distanza = 0.034 * durata / 2;
Serial.print("distanza: ");
//durata in millisecondi
if( durata > 38000 ){
Serial.println("Fuori portata ");
}
else{
Serial.print(distanza);
Serial.println(" cm");
int fadeValue = map(durata, 0, 38000, 0, 255)
analogWrite(led, fadeValue);
}
delay(1000);
}
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