问当连接到ESP8266时，DHT11传感器保持打印255的温度和湿度

EN

Read failFailed to read from DHT
Humidity: 255.00 %  Temperature: 255.00 *C
Humidity: 255.00 %  Temperature: 255.00 *C
Humidity: 255.00 %  Temperature: 255.00 *C
Read failFailed to read from DHT
Humidity: 255.00 %  Temperature: 255.00 *C
Humidity: 255.00 %  Temperature: 255.00 *C
Humidity: 255.00 %  Temperature: 255.00 *C
Read failFailed to read from DHT
Humidity: 255.00 %  Temperature: 255.00 *C
Humidity: 255.00 %  Temperature: 255.00 *C
Humidity: 255.00 %  Temperature: 255.00 *C

#include "DHT.h"
#include "Arduino.h"

#define DHTPIN 5   

#define DHTTYPE DHT11   


DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600); 
  Serial.println("DHTxx test!");

  dht.begin();
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  if (isnan(t) || isnan(h)) {
    Serial.println("Failed to read from DHT");
  } else {
    Serial.print("Humidity: "); 
    Serial.print(h);
    Serial.print(" %\t");
    Serial.print("Temperature: "); 
    Serial.print(t);
    Serial.println(" *C");
  }
}