// Define Relay Control Pin
const int relayPin = 8;

// Time configurations (Adjust these variables as needed)
const unsigned long TIME_ON  = 5000;  // How long the appliance stays ON (5 seconds)
const unsigned long TIME_OFF = 7000;  // How long the appliance stays OFF (7 seconds)

// Tracking variables
unsigned long previousMillis = 0;
bool isRelayActive = false;

void setup() {
  // Configure the relay control pin as an output
  pinMode(relayPin, OUTPUT);
  
  // Set initial state to OFF
  digitalWrite(relayPin, LOW);
  
  // Initialize the Serial Monitor
  Serial.begin(9600);
  Serial.println("--- Time-Controlled Relay System Online ---");
  Serial.print("Cycle Configured: OFF for ");
  Serial.print(TIME_OFF / 1000);
  Serial.print("s, then ON for ");
  Serial.print(TIME_ON / 1000);
  Serial.println("s.");
}

void loop() {
  // Get the current running runtime of the microcontroller
  unsigned long currentMillis = millis();
  
  // Check the current state of our timer track
  if (isRelayActive) {
    // If the relay is currently ON, check if it's time to turn it OFF
    if (currentMillis - previousMillis >= TIME_ON) {
      digitalWrite(relayPin, LOW);     // Turn off physical relay
      isRelayActive = false;           // Update software state tracker
      previousMillis = currentMillis;  // Reset time marker
      Serial.println("[TIMER EVENT] Relay turned OFF. Safe cycle resting...");
    }
  } 
  else {
    // If the relay is currently OFF, check if it's time to turn it ON
    if (currentMillis - previousMillis >= TIME_OFF) {
      digitalWrite(relayPin, HIGH);    // Turn on physical relay
      isRelayActive = true;            // Update software state tracker
      previousMillis = currentMillis;  // Reset time marker
      Serial.println("[TIMER EVENT] Relay activated! Load is powered ON.");
    }
  }
}