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#include < SoftwareSerial.h >
    #include < DHT.h >
    #define DHTPIN 2      // Conectar el pin DATA del DHT11 a este pin en Arduino Nano
#define DHTTYPE DHT11 // DHT 11 
DHT dht(DHTPIN, DHTTYPE);
SoftwareSerial bluetooth(0, 1); // RX | TX 
void setup() {
    Serial.begin(9600);
    bluetooth.begin(9600);
    dht.begin();
}
void loop() {
    delay(2000);
  float humedad = dht.readHumidity();
    if (isnan(humedad)) {
        bluetooth.println("Error al leer el DHT11");

Line: 1:12: Cannot find name 'SoftwareSerial'.Line: 2:16: Cannot find name 'DHT'.Line: 4:13: Cannot find name 'DHTPIN'.Line: 5:9: Cannot find name 'DHTTYPE'.Line: 5:17: Cannot find name 'DHT11'.Line: 6:1: Cannot find name 'DHT'.Line: 6:5: Cannot find name 'dht'.Line: 6:9: Cannot find name 'DHTPIN'.Line: 6:17: Cannot find name 'DHTTYPE'.Line: 8:1: Cannot find name 'SoftwareSerial'.Line: 8:16: Cannot find name 'bluetooth'.Line: 10:6: Cannot find name 'setup'.Line: 11:5: Cannot find name 'Serial'.Line: 12:5: Cannot find name 'bluetooth'.Line: 13:5: Cannot find name 'dht'.Line: 16:6: Cannot find name 'loop'.Line: 17:5: Cannot find name 'delay'.Line: 18:3: Cannot find name 'float'.Line: 18:9: Cannot find name 'humedad'.Line: 18:19: Cannot find name 'dht'.Line: 19:9: Cannot find name 'isnan'.Line: 19:15: Cannot find name 'humedad'.Line: 20:9: Cannot find name 'bluetooth'.Line: 22:9: Cannot find name 'bluetooth'.Line: 22:27: Cannot find name 'humedad'.Line: 4:13: ';' expected.Line: 5:9: ';' expected.Line: 6:1: Unexpected keyword or identifier.Line: 8:1: Unexpected keyword or identifier.Line: 10:14: ';' expected.Line: 16:13: ';' expected.Line: 18:3: Unexpected keyword or identifier.