const int led1=6;
const int led2=7;
const int led3=8;
 
unsigned long previousMillis;
const unsigned long interval = 5000;
boolean enableDelay = false;

float sourceOvervoltage = 54.00; //Source Overvoltage
const int analogInput1 = A0; // voltage measurement pin
int value1 = 0;
float vout1 = 0.0;
float vSource = 0.0;
float R1a =100000;
float pot1 = 10000;

void setup()
{
 Serial.begin(9600);  
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT); 
}

void loop() 
{
value1 = analogRead(analogInput1);
vout1 = (value1 * 5.0) / 1024;
vSource = vout1 / (pot1/(R1a+pot1));

  unsigned long currentMillis = millis();

  // Trigger the delay
  if (vSource>=sourceOvervoltage){
  enableDelay = true;
  if (enableDelay){ 
   //Serial.println("currentMillis - previousMillis");
    //Serial.println(currentMillis - previousMillis);
  if (currentMillis - previousMillis >= interval){
    digitalWrite(led1, HIGH);
  }
  }
  }

  // Checking the millis delay should be done in the loop.
  // This code is not inside the code to start the delay, but
  // at the same level as other code in the loop.
  //if (enableDelay){
    
  if (vSource<=sourceOvervoltage){
   
      enableDelay = false;
//previousMillis = currentMillis;
      digitalWrite(led1, LOW);
 
    }
  //}
}