const int analogInputPin = A0;

// Define voltage thresholds
const float voltageThreshold1 = 2.5;
const float voltageThreshold2 = 4;

// Define LED output pins
const int ledPin1 = 2;  // green led
const int ledPin2 = 3;  // red led
const int ledPin3 = 4;  // relay
const int ledPin4 = 5;  // error
boolean status_count = false; // detect the switching 
int count = 0;  // just a counter

void turnon(){
    digitalWrite(ledPin1, HIGH); // Turn on green led
    digitalWrite(ledPin2, LOW); // Turn off red led
    digitalWrite(ledPin3, LOW); // Turn off relay
}

void turnoff(){
digitalWrite(ledPin1, LOW); // Turn off green led
    digitalWrite(ledPin2, HIGH); // Turn on red led
    digitalWrite(ledPin3, HIGH); // Turn on relay
}

void setup() {
  Serial.begin(9600); // Initialize serial communication
  pinMode(analogInputPin, INPUT); // Set the analog pin as input
  pinMode(ledPin1, OUTPUT); // Set the green led pin as output
  pinMode(ledPin2, OUTPUT); // Set the red led
  pinMode(ledPin3, OUTPUT); // Set the relay
  pinMode(ledPin4, OUTPUT); // error
  turnon();
}

void loop() {
  
  

  for (int i = 0 ; i <  180 ; i++){

  delay(1000); // Wait for a second before the next reading
  int sensorValue = analogRead(analogInputPin); // Read the analog input value
  float voltage = sensorValue * (5.0 / 1023.0); // Convert the value to voltage
  Serial.print(voltage);Serial.print(" / ");Serial.println(count);

  if (voltage < voltageThreshold1) {
    if (status_count == false) { count = count + 1; status_count =true ;}
      turnoff();} 
  if (voltage > voltageThreshold2) {
       status_count =false ;
      turnon(); } 

  if (count >2){
    digitalWrite(ledPin4, HIGH); 
    Serial.println("waiting");
    while(1){}
    
    }
  
  

  } if (count <3){ count = 0;}   // if nothing happen after 3 mins
  
   
}