// PWM Fan Control with ESP32 in Wokwi

const int fanPin = 5;       // PWM output to fan (can be simulated with LED)
const int pwmFreq = 25000;  // 25kHz PWM frequency
const int pwmChannel = 0;   // PWM channel
const int pwmResolution = 8;// 8-bit resolution (0-255)

int fanSpeed = 128;         // Mid speed (50%)

void setup() {
  Serial.begin(115200);
  ledcSetup(pwmChannel, pwmFreq, pwmResolution);  // Configure PWM
  ledcAttachPin(fanPin, pwmChannel);              // Attach pin to channel
  ledcWrite(pwmChannel, fanSpeed);                // Set initial speed

  Serial.println("PWM Fan Control Initialized");
}

void loop() {
  // Simulate dynamic control (e.g., from temperature sensor)
  for (int speed = 0; speed <= 255; speed += 5) {
    ledcWrite(pwmChannel, speed);
    Serial.print("Fan Speed PWM: ");
    Serial.println(speed);
    delay(100);
  }

  for (int speed = 255; speed >= 0; speed -= 5) {
    ledcWrite(pwmChannel, speed);
    Serial.print("Fan Speed PWM: ");
    Serial.println(speed);
    delay(100);
  }
}