void setup() {
  Serial.begin(9600);
  pinMode(5, OUTPUT);
}

void loop() {

  Serial.println("-------------------");
  while (!Serial.available()) {}
  int period = Serial.parseInt();
  if (Serial.read() == '\n') {
    Serial.print("Період: ");
    Serial.println(period);
  }

  while (!Serial.available()) {}
  float dutyCycle = Serial.parseFloat();
  if (Serial.read() == '\n') {
    Serial.print("Коефіцієнт: ");
    Serial.println(dutyCycle);
  }

  if (dutyCycle < 0.0) {
    dutyCycle = 0.0;
  } else if (dutyCycle > 1.0) {
    dutyCycle = 1.0;
  }
  
  int onTime = period * dutyCycle;
  int offTime = period - onTime;

  for (int i = 0; i < 10; i++) {
    digitalWrite(5, HIGH);
    delay(onTime);
    digitalWrite(5, LOW);
    delay(offTime);
  }

  delay(5000);
}