// Sketch to toggle a relay and an LED with a push button.
// - When the relay is active, an LED connected to it will blink.
// - An LED connected directly to Arduino will blink based on button presses, independent of the relay.

#define relayOn LOW
#define ledOn LOW
#define relayOff HIGH
#define ledOff HIGH

const int ledPin = 4;           // LED directly connected to Arduino
const int ledRelayPin = 7;      // LED connected through relay
const int buttonPin = 2;

int relayState = relayOff;       // the current state of the relay
int ledState = ledOff;           // the current state of the led
int previousButtonState = LOW;   // the previous state of the button

unsigned long buttonTime = 0;    // The last time the relay state was toggled
unsigned long debounceTime = 400;  // debounce time (for noisy buttons)

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);
  pinMode(ledPin, OUTPUT);
  pinMode(ledRelayPin, OUTPUT);
  
  // Explicitly set the LEDs to off
  digitalWrite(ledPin, ledOff);
  digitalWrite(ledRelayPin, relayOff);
}

void loop() {
  int buttonState = digitalRead(buttonPin);

  // Toggle relay state logic
  if (buttonState == LOW && previousButtonState == HIGH && millis() - buttonTime > debounceTime) {
    relayState = (relayState == relayOff) ? relayOn : relayOff;
    ledState = (ledState == ledOff) ? ledOn : ledOff; // Toggle the LED's blinking state
    buttonTime = millis();
  }

  // Blinking logic for LED connected to relay
  if (relayState == relayOn) {
    digitalWrite(ledRelayPin, (millis() % 900 < 300) ? relayOn : relayOff);
  } else {
    digitalWrite(ledRelayPin, relayOn);
  }

  // Blinking logic for LED connected directly to Arduino
  if (ledState == ledOn) {
    digitalWrite(ledPin, (millis() >> 9) & 3);  //Blink
  } else {
    digitalWrite(ledPin, ledOn);
  }

  previousButtonState = buttonState;
}