const int ledPin = 9;
int rate = 12;

void setup() {
    pinMode(ledPin, OUTPUT);
}

void loop() {
    // Ramp up the LED brightness from 0 to maximum
    for (int brightness = 0; brightness <= 255; brightness++) {
        analogWrite(ledPin, brightness); // Set the LED brightness
        delay(rate); // Adjust delay for brightness change rate
    }

    delay(1000); // Run at maximum brightness for 1 second

    for (int brightness = 255; brightness >= 0; brightness--) {
        analogWrite(ledPin, brightness); // Set the LED brightness
        delay(rate); // Adjust delay for brightness change rate
    }

    delay(1000); // Wait for 1 second before restarting the cycle
}