//Kiki La Pica November 4 2022

int red=13;
int yellow=12; 
int green=11;

void setup() {
  pinMode(red, OUTPUT);
  pinMode(yellow, OUTPUT);
  pinMode(green, OUTPUT);
}

void loop() {
  if(distance<=10){ 
    digitalWrite(red,HIGH);
    digitalWrite(yellow,LOW);
    digitalWrite(green,LOW);
  } else if(distance<=20){
    digitalWrite(red,LOW);
    digitalWrite(yellow,HIGH);
    digitalWrite(green,LOW);
  } else { 
    digitalWrite(red,LOW);  
    digitalWrite(yellow,LOW);
    digitalWrite(green,HIGH;
  }