int trig=4;
int echo=5;
int red=10;
int blue=11;

long duration, distance;

void setup() {
  // put your setup code here, to run once:
pinMode(trig, OUTPUT);
pinMode(echo, INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(trig, LOW);
delayMicroseconds(2);
digitalWrite(trig, HIGH);
delayMicroseconds(10);

duration = pulseIn(echo, HIGH);
distance = duration*0.034/2;

Serial.print("distance: ");
Serial.println(distance);


if (distance>150) {
  digitalWrite(red, HIGH);
  digitalWrite(blue, LOW);
}
else {
  digitalWrite(blue, HIGH);
  digitalWrite(red, LOW);
}

}