void setup() {
  // initialize digital pin 7 as an output.
  pinMode(7, OUTPUT);
}

void loop() {
  // Increment the PWM value from 10 to 250 in steps of 10
  for (int pwmValue = 10; pwmValue <= 250; pwmValue += 10) {
    analogWrite(7, pwmValue);  // Set the PWM value
    delay(1000);  // Wait for a second
  }
}