#define READ_DELAY 1000

unsigned long lastUpdate; //tracks clock time of last temp update

//call repeatedly in loop, only updates after a certain time interval
//returns true if update happened
bool my_update() {
  if ((millis() - lastUpdate) > READ_DELAY) {
    lastUpdate = millis();
    return true;
  }
  return false;
}

void setup() {
  Serial.begin(9600);
  // put your setup code here, to run once:
  while (!my_update()) {} //wait until updated
}

void loop() {
  // put your main code here, to run repeatedly:
  Serial.print(my_update());
}