arduino lcd dht11值測出來一直顯示nan？

ID:735294 · 發(fā)表于 2020-5-2 18:01

為什么我的溫濕度的值測出來一直顯示nan？有大佬可以幫忙解決一下嗎？
這是我的代碼：
#include <DHT.h>
#include <DHT_U.h>
#include <LiquidCrystal.h>
#define DHTPIN 8
#define DHTTYPE DHT11
DHT dht(DHTPIN, DHTTYPE);
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
void setup() {
//put your setup code here, to run once:
  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("start");
  delay(1000);
  dht.begin();
  Serial.begin(9600);
  Serial.println("DHT11 TEST PROGRAM ");
  Serial.println();
}
void loop() {

  // put your main code here, to run repeatedly:
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  Serial.println("\n");
  lcd.setCursor(0, 0);
  lcd.print("Hum:");
  lcd.setCursor(7, 0);
  lcd.print(h);
  lcd.setCursor(11, 0);
  lcd.print("%");
  lcd.setCursor(0, 1);
  lcd.print("Temp:");
  lcd.setCursor(7, 1);
  lcd.print(t);
  lcd.setCursor(11,1);
  lcd.print((char)223);    //液晶顯示“°”
  lcd.print("C");          //液晶顯示“C”
  Serial.print("Humidity: ");//濕度
  Serial.println(h);
  Serial.print("Temperature: ");//溫度
  Serial.print(t);
  Serial.println(" ℃ ");
  delay(2000);
}