int sensorPin = A0;  
unsigned int sensorValue = 0; 

void setup() {
 pinMode(sensorPin, INPUT);
 Serial.begin(9600);
 pinMode(sensorPin,INPUT);
}
void loop() {
  sensorValue = analogRead(sensorPin);
  Serial.print("Analognya :");
  Serial.println(sensorValue);
  
  float resistansi=sensorValue*(100000.0/1023.0);
  Serial.print("resistansinya :");
  Serial.println(resistansi);
  Serial.print("sensor value :");
  Serial.println(sensorValue);

  if(sensorValue>1009)digitalWrite(13,HIGH);
  else digitalWrite(13,LOW);
  delay(1000);
}