#define sensorPin   A4
#define greenLEDPin 3
#define redLEDPin   2

long delayTime = 1000;
int val = 0 ;

void setup() {

  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
  pinMode(greenLEDPin, OUTPUT);
  pinMode(redLEDPin, OUTPUT);

  digitalWrite(greenLEDPin, LOW);
  digitalWrite(redLEDPin, HIGH);

}


void loop() {

  val = analogRead(sensorPin);
  Serial.println(val);

  if (val >50 ) {
    digitalWrite(greenLEDPin, HIGH);
    digitalWrite(redLEDPin, LOW);
    delay(delayTime);
  }
  else {
    digitalWrite(greenLEDPin, LOW);
    digitalWrite(redLEDPin, HIGH);
  }

  delay(100);

}//end of LOOP