#define LED01 11
 #define rtd A3
 int lrtd;
void setup() {
 
  // put your setup code here, to run once:
pinMode(LED01, OUTPUT);

}

void loop(){
  lrtd=analogRead(rtd);
  digitalWrite(LED01,HIGH);
delay(1000);
 digitalWrite(LED01,LOW);
delay(1000);

}