#define RXD2 16
#define TXD2 17
HardwareSerial gpsSerial(2);

void setup() {
  Serial.begin(115200);
  delay(2000);
  Serial.println("\n=== BAUD SCANNER GPS NEO-6M ===");
}

void loop() {
  int bauds[] = {4800, 9600, 19200, 38400, 57600, 115200};
  for(int i = 0; i < 6; i++) {
    int baud = bauds[i];
    gpsSerial.end();
    gpsSerial.begin(baud, SERIAL_8N1, RXD2, TXD2);
    
    Serial.print("🔍 Probando ");
    Serial.print(baud);
    Serial.print(" baud... ");
    delay(1000);
    
    int dollars = 0;
    unsigned long start = millis();
    while(millis() - start < 3000) {  // 3 seg
      if(gpsSerial.available()) {
        char c = gpsSerial.read();
        Serial.print(c);
        if(c == '$') dollars++;
        if(dollars >= 5) break;  // ¡Encontró NMEA!
      }
    }
    Serial.println("\n---");
    
    if(dollars >= 3) {
      Serial.println("🎉 *** ¡BAUD CORRECTO! Usa este: " + String(baud) + " ***");
      Serial.println("Copia los datos NMEA arriba ^");
      delay(10000);  // Pausa para leer
    }
  }
  Serial.println("🔄 Reiniciando scan...\n");
  delay(5000);
}