const int trigpin = 11;
const int echopin =6;
const int redLEDpin =4;
const int greenLEDin =3;
long duration;
int distance;
void setup(){
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);
  pinMode(redLEDpin, OUTPUT);
  pinMode(greenLEDin, OUTPUT);
}
void loop(){
  digitalWrite(trinpin, LOW);
  delay
}