int temp=45;

void setup() {
  // put your setup code here, to run once:
  pinMode(12, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
while (temp >30)
{
  digitalWrite(12, HIGH); delay(500);
  digitalWrite(12,LOW); delay(500);
  temp =temp-1;
  Serial.println(temp);
}

}