PMW with duty cycle?

Projects Programming
5

10Hz = 100 milliseconds.
What input will trigger the change in duty cycle?

int i = 50;
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
}
void loop() {
  digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(i);
  digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
  delay(100 - i);                    // 10 Hz = 100 millis
}
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