void setup() {
pinMode(11, OUTPUT);
pinMode(12, OUTPUT);
pinMode(13, OUTPUT);

pinMode(3, OUTPUT);
pinMode(2, INPUT);

Serial.begin(115200);
}
void loop() {
digitalWrite(3,HIGH);
delayMicroseconds(10);
digitalWrite(3, LOW);

int duration = pulseIn(2, HIGH);
int distance = duration / 58;

if (distance < 5) {
digitalWrite(11, HIGH);
}
else {
digitalWrite(11, LOW);
}

if (distance < 15 && distance > 5) {
digitalWrite(12, HIGH);
}
else {
digitalWrite(12, LOW);
}

if (distance < 400 && (distance > 15)) {
digitalWrite(13, HIGH);
}
else {
digitalWrite(13, LOW);
}
}