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

void loop() {
  // Get the current CPU frequency
  uint32_t clockSpeed = ESP.getCpuFreqMHz();

  // Print the clock speed to the Serial Monitor
  Serial.print("CPU Frequency: ");
  Serial.print(clockSpeed);
  Serial.println(" MHz");

  // Delay for a second
  delay(1000);
}