// Program: VariableFreq-E_v5.ino
// Wokwi:   https://wokwi.com/projects/412917921801216001

#define LED 25    // define GPIO pin no. for the LED output

int freq = 1000;  // initial PWM frequency
int resolution = 8;

void setup() {
  Serial.begin(115200);

  ledcAttach(LED, freq, resolution);
}

void loop() {
  for (int frequency = 0; frequency <= 4000; frequency = frequency + 200) {
    Serial.print("Frequency = ");
    Serial.println(frequency);

    // Write a new frequency to the output pin with a duty cycle of 50%
    ledcWriteTone(LED, frequency);

    delay(1500);
  }
}