const int TrigPin=4;// #define TrigPin 4
const int EchoPin=2;// #degine EchoPin 2
long duration;
int distance;
#define RLED 17 
#define GLED 16

void setup()
{
  Serial.begin(9600);
  pinMode(TrigPin, OUTPUT);
  pinMode(EchoPin, INPUT);
  pinMode(RLED, OUTPUT);
  pinMode(GLED, OUTPUT);
}

void loop()
{
  digitalWrite(TrigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(TrigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(TrigPin, LOW);

  duration=pulseIn(EchoPin, HIGH);
  distance=duration*0.034/2;
  Serial.print("Dist:");
  Serial.print(distance);
  Serial.println("cm");

  if(distance,>100)
  {
    digitalWrite(RLED, HIGH);
    digitalWrite(GLED, LOW);
  }
  else
  {
    digitalWrite(RLED, LOW);
    digitalWrite(GLED, HIGH);
  }
 }