Sensore ad ultrasuoni con led.

long tempo=0;

const float c=0.017;

void setup()

{

for(int i=5; i<=7; i++)

pinMode(i, OUTPUT);

pinMode(13, OUTPUT); //trig

pinMode(12, INPUT); //echo

Serial.begin(9600);

}

void loop()

{

digitalWrite(13, LOW);

digitalWrite(13, HIGH);

delayMicroseconds(10);

digitalWrite(13, LOW);

tempo=pulseIn(12, HIGH);

distanza=tempo*c;

Serial.print(distanza);

Serial.print(”    “);

Serial.println(tempo);

if(distanza<40){

/*digitalWrite(7 ,LOW);

digitalWrite(6, LOW);

digitalWrite(5, LOW);*/

}

digitalWrite(7, HIGH);

//digitalWrite(6, LOW);

//digitalWrite(5, LOW);

}

else if(distanza>=100 && distanza<200){

digitalWrite(7, HIGH);

digitalWrite(6, HIGH);

digitalWrite(5, LOW);

}

else if(distanza>=200 && distanza<300){

digitalWrite(7, HIGH);

digitalWrite(6, HIGH);

digitalWrite(5, HIGH);

}

delay(1000);

}