void setup() {

  Serial.begin(9600);
  pinMode(15, OUTPUT);
  digitalWrite(15,LOW);
}

void loop() {

  int sensorValue = analogRead(26);
   // print out the value you read:
  Serial.println(sensorValue);
  delay(100);    

if (sensorValue <10)
  {
   digitalWrite(15,HIGH);
  }
else if (11<sensorValue && sensorValue<100 )
   
    {
     digitalWrite(15,HIGH);
     delay(50);
     digitalWrite(15,LOW);
     delay(50);
    }

 else if(101<sensorValue && sensorValue<250)
   
    {
     digitalWrite(15,HIGH);
     delay(1000);
     digitalWrite(15,LOW);
     delay(1000);
    }

  

else
    
      {
        digitalWrite(15,LOW);
      }
  }