void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
pinMode(26, INPUT);
pinMode(21, OUTPUT);
}

void loop() {
int Idrvalue=analogRead(13);
Serial.println(Idrvalue);

if(Idrvalue<=1700){
  digitalWrite(21, HIGH);
  delay(100);
}

else{
  digitalWrite(21, LOW);
delay(100);
}
}