const int LED1 = 23;    // GPIO pin connected to LED1
const int LED2 = 19;    // GPIO pin connected to LED2
const int LED3 = 18;    // GPIO pin connected to LED3

unsigned long previousLed1Millis = 0;    // Variable to store the last time LED1 was updated
unsigned long previousLed2Millis = 0;    // Variable to store the last time LED2 was updated
unsigned long previousLed3Millis = 0;    // Variable to store the last time LED3 was updated

const long led1Interval = 1000;    // Interval at which to toggle LED1 (milliseconds)
const long led2Interval = 2000;    // Interval at which to toggle LED2 (milliseconds)
const long led3Interval = 3000;    // Interval at which to toggle LED3 (milliseconds)

bool led1State = LOW;    // Initial state of LED1
bool led2State = LOW;    // Initial state of LED2
bool led3State = LOW;    // Initial state of LED3
void setup() {
  // Initialize GPIO pins as outputs
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(LED3, OUTPUT);
}

void loop() {
  unsigned long currentMillis = millis();

  // Toggle LED1 state every 1 second
  if (currentMillis - previousLed1Millis >= led1Interval) {
    previousLed1Millis = currentMillis;
    led1State = !led1State;
    digitalWrite(LED1, led1State);
  }

    // Toggle LED2 state every 2 seconds
  if (currentMillis - previousLed2Millis >= led2Interval) {
    previousLed2Millis = currentMillis;
    led2State = !led2State;
    digitalWrite(LED2, led2State);
  }
    // Toggle LED3 state every 3 seconds
  if (currentMillis - previousLed3Millis >= led3Interval) {
    previousLed3Millis = currentMillis;
    led3State = !led3State;
    digitalWrite(LED3, led3State);

  }

}