在 Arduino IDE 上运行代码时出现库错误

问题描述

我有以下错误：

在 C:\Users\Lenovo\OneDrive\Documents\Arduino\libraries\Blynk\src/Blynk/BlynkApi.h:37:0 包含的文件中， 来自 C:\Users\Lenovo\OneDrive\Documents\Arduino\libraries\Blynk\src/BlynkApiArduino.h:14， 来自 C:\Users\Lenovo\OneDrive\Documents\Arduino\libraries\Blynk\src/BlynkSimpleEsp8266.h:24， 来自 C:\Users\Lenovo\OneDrive\Desktop\sketch_mar31a\sketch_mar31a.ino:36： C:\Users\Lenovo\OneDrive\Documents\Arduino\libraries\Blynk\src/Blynk/BlynkTimer.h:36:21: 错误：重新定义“类 BlynkTimer” #define SimpleTimer BlynkTimer ^ C:\Users\Lenovo\OneDrive\Documents\Arduino\libraries\SimpleTimer-1.0.0/SimpleTimer.h:10:7：注意：在宏“SimpleTimer”的扩展中 类 SimpleTimer { ^ C:\Users\Lenovo\OneDrive\Documents\Arduino\libraries\Blynk\src/Blynk/BlynkTimer.h:36:21: 错误：'class BlynkTimer' 的先前定义 #define SimpleTimer BlynkTimer ^ C:\Users\Lenovo\OneDrive\Documents\Arduino\libraries\Blynk\src/Blynk/BlynkTimer.h:41:7：注意：在宏“SimpleTimer”的扩展中 类 SimpleTimer { ^ 退出状态 1 Eroare de compilare pentru placa NodeMCU 1.0（ESP-12E 模块）。

当我使用此代码时：

#define BLYNK_PRINT Serial    // Comment this out to disable prints and save space
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
#include <DHT.h>


// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "wwnCVJrGmlkVcYrYsCq-RjO2A0C5s16t"; //Enter the Auth code which was send by Blink

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "DIGI-7v32";  //Enter your WIFI Name
char pass[] = "2UWCQ6R4";  //Enter your WIFI Password

#define DHTPIN 2          // Digital pin 4

// Uncomment whatever type you're using!
#define DHTTYPE DHT11     // DHT 11
//#define DHTTYPE DHT22   // DHT 22,AM2302,AM2321
//#define DHTTYPE DHT21   // DHT 21,AM2301

DHT dht(DHTPIN,DHTTYPE);
SimpleTimer timer;

// This function sends Arduino's up time every second to Virtual Pin (5).
// In the app,Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void sendSensor()
{
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit

  if (isnan(h) || isnan(t)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V5,h);  //V5 is for Humidity
  Blynk.virtualWrite(V6,t);  //V6 is for Temperature
}

void setup()
{
  Serial.begin(9600); // See the connection status in Serial Monitor
  Blynk.begin(auth,ssid,pass);

  dht.begin();

  // Setup a function to be called every second
  timer.setInterval(1000L,sendSensor);
}

void loop()
{
  Blynk.run(); // Initiates Blynk
  timer.run(); // Initiates SimpleTimer
}

解决方法

Blynk 使用开源 SimpleTimer 库。

有很多名为 SimpleTimer 的库 - 请参阅 GitHub Search Results。

如果您的库版本与 Blynk 使用的版本不同，您可能会收到编译错误：

BlynkTimer.h: 36:21: error: redefinition of 'class BlynkTimer

如果您使用 Blynk 使用的库 - marcelloromani/Arduino-SimpleTimer - 您不会在构建时出错，并且可以 #include <SimpleTimer.h> 并与 Blynk 一起使用它，没有问题。

如果您使用 Blynk，建议使用 BynkTimer 而不是 `SimpleTimer'，原因如下：

当 BlynkTimer 难以多次运行时（由于循环阻塞），它只会跳过所有错过的时间间隔，并且只调用一次您的函数。 New Blynk Library Release v0.5.3 - June 2018

要更改您的代码，请删除

#include <SimpleTimer.h>

并替换

SimpleTimer timer;

与

BlynkTimer timer;