function 2

void blinkLED(int LEDpin, int blinkFlag){

  /* takes the pin to 'blink' on, flag controls whether or not LED blinks (should be able to turn blink on/off with 1/0 respectively)
   */

  static int blinkFlagValue = 0; // turns blinking on/off (1/0 respectively)
   const int blinkInterval = 1000; // time between switching LED output (ms)
  static int LEDState = LOW; // tracking if LED is on or off when function called
  static unsigned long previousMillis = 0; // contains value of currentValue from last time function was called


  unsigned long currentMillis = millis(); // get current millisecond count

  Serial.println(currentMillis);  // debug - show current value
  Serial.println(previousMillis); // debug - show past value

  if((currentMillis - previousMillis >= blinkInterval)  && blinkFlag == 1){ // compare current to previous and if longer than the specified interval, continue with function work
    previousMillis = currentMillis; // update past value for comparison next time function is called
    if(LEDState == LOW){ // check to see if LED is off
      LEDState = HIGH; // turn LED on (if LED is off)
      }
    else{
      LEDState = LOW; // turn LED off (if LED is on)
      }

    digitalWrite(LEDpin, LEDState);  // output to real hardware
  }
    Serial.println(LEDState); // debug - show current value of LEDState
  }