#define led_pwm 4           
#define chave_modo 5       
#define ldr 34              
#define pot 33             
#define led_modo 15 

int ldrValue = 0;             
int potValue = 0;
int mode = 0;

void setup() {
  pinMode(led_pwm, OUTPUT); 
  pinMode(chave_modo, INPUT);  
  pinMode(led_modo, OUTPUT); 
  pinMode(ldr, INPUT);
  Serial.begin(115200);

  ledcAttach(led_pwm, 5000, 10);
}
void loop() {


  mode = digitalRead(chave_modo);

  if (mode == HIGH) {
    digitalWrite(led_modo, HIGH);
    Serial.println(" Modo automático");
    controlAutoMode();
  } else {
    digitalWrite(led_modo, LOW); 
    Serial.println(" Modo manual");
    controlManualMode();
  }

  delay(10);
}
void controlAutoMode() {
  ldrValue = analogRead(ldr);
  
  int pwmValue = map(ldrValue, 0, 1023, 255, 0); 

  float tensao = ldrValue * 5.0 / 1023.0;
  if (tensao > 0) {
    ldrValue = (2500 / tensao - 500) / 10;
  } else {
    ldrValue = 0;
  }

  ldrValue = constrain(ldrValue, 0, 255);
  ledcWrite(led_pwm, ldrValue);

  Serial.print("LDR: ");
  Serial.print(ldrValue);
  Serial.print(" PWM: ");
  Serial.println(pwmValue);
}


void controlManualMode() {

  potValue = analogRead(pot);
  
  int pwmValue = map(potValue, 0, 4095, 0, 4095);
  ledcWrite(led_pwm, potValue);
  Serial.print("Potenciômetro: ");
  Serial.print(potValue);
  Serial.print(" PWM: ");
  Serial.println(pwmValue);
}