const int AnanlonginPin = A0;
const int RelayPin = 2;
int sensorvalue = 0;
int outputvalue = 0;

void setup(){
  Serial.begin(9600);
  pinMode(RelayPin, OUTPUT);

}
void loop(){
  sensorvalue = analogRead(AnanlonginPin);
  outputvalue = map(sensorvalue,0,1023,100,0);
  Serial.print(outputvalue);
  Serial.println("%");
  if (outputvalue <=40)
  {
    digitalWrite(RelayPin, HIGH);

  }else{
     digitalWrite(RelayPin, LOW);
  }
  delay(2000);
}