int Trig = 26;
int Echo = 27;
int Red = 12;
int Yellow = 13;
int Green = 14;
int distance;


void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  pinMode(Trig, OUTPUT);
  pinMode(Echo, INPUT);
  pinMode(Red, OUTPUT);
  pinMode(Yellow, OUTPUT);
  pinMode(Green, OUTPUT);
}

void loop() {
  digitalWrite(Trig, HIGH);
  delay(100);
  digitalWrite(Trig, LOW);
  int reading =(pulseIn(Echo,HIGH));
  distance = (reading*0.034/2)+1;
   if (distance>300)
{
  digitalWrite(Green, HIGH);
  digitalWrite(Yellow, LOW);
  digitalWrite(Red, LOW);
}  
else if (distance>200)
{
  digitalWrite(Green, LOW);
  digitalWrite(Yellow, HIGH);
  digitalWrite(Red, LOW);
}
else if (distance<101)
{
  digitalWrite(Green, LOW);
  digitalWrite(Yellow, LOW);
  digitalWrite(Red, HIGH);

}
Serial.println(distance);
}