Arduino 软件："request for member 'read11' in 'sensor', which is of non-class type 'DHT()'"

Question

我使用我的 arduino 代码收到此错误消息 "request for member 'read11' in 'sensor', which is of non-class type 'DHT()'"

#include <DHT.h>


#include <LiquidCrystal.h>


LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
int greenPin = A0;
DHT sensor();

void setup()
{
  lcd.begin(16,2); //16 by 2 character display
}

void loop()
{
  delay(1000); //wait a sec (recommended for DHT11)
  sensor.read11(greenPin);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Humidity = ");
  lcd.print(sensor.humidity);
  lcd.setCursor(0,1);
  lcd.print("Temp = ");
  lcd.print(sensor.temperature);
}

我已经下载了它说要下载的库，请帮忙！

顺便说一句，我是从这个网站上拿来的，只是为了避免版权问题： https://www.hive-rd.com/blog/arduino-dht11-output-lcd-module/

Answer 1

在线

DHT sensor();

括号的使用导致此行被解析为函数 sensor() 的前向声明，不带参数，返回类型 DHT。您想要的只是将 sensor 定义为类型为 dht 的变量（注意：本教程使用小写。）正确的语法是：

#include <dht.h>
/* code */
dht sensor;

如果您参考所链接的教程，您会看到它在代码示例中的显示方式。

Arduino 软件："request for member 'read11' in 'sensor', which is of non-class type 'DHT()'"

Arduino software: "request for member 'read11' in 'sensor', which is of non-class type 'DHT()'"

lcd

arduino-uno