const int ledPin =  0;// the number of the LED pin

// Variables will change :
int ledState = LOW;             // ledState used to set the LED

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;        // will store last time LED was updated

// constants won't change :
const long led_interval = 250;           // interval at which to blink (milliseconds)
const long lcd_interval = 1000;

void setup() {
  // set the digital pin as output:
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // here is where you'd put code that needs to be running all the time.

  // check to see if it's time to blink the LED; that is, if the
  // difference between the current time and last time you blinked
  // the LED is bigger than the interval at which you want to
  // blink the LED.
  unsigned long currentMillis = millis();

  if (currentMillis - previousMillis >= led_interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;

    // if the LED is off turn it on and vice-versa:
    if (ledState == LOW) {
      ledState = HIGH;
      led_interval = 500;
    } else {
      ledState = LOW;
      led_interval = 250;
    }

    // set the LED with the ledState of the variable:
    digitalWrite(ledPin, ledState);
  }

  if (currentMillis - previousMillis >= lcd_interval) {
    // save the last time you blinked the LED
    previousMillis = currentMillis;

    // do the LCD shit here
  }
}