C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino: In function 'void get_value()': C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino:128:34: error: no matching function for call to 'println(const char [3], int&)' 128 | Serial.println("%d",sensor[0]); | ^ In file included from C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Stream.h:27, from C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/HardwareSerial.h:32, from C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Arduino.h:303, from C:\Users\conservator\AppData\Local\Temp\arduino\sketches\304EB848CF381B8A7A8E84D646752A81\sketch\mqttToAliyun.ino.cpp:1: C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Print.h:102:16: note: candidate: 'size_t Print::println(unsigned char, int)' (near match) 102 | size_t println(unsigned char, int = DEC); | ^~~~~~~ C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Print.h:102:16: note: conversion of argument 1 would be ill-formed: C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino:128:20: error: invalid conversion from 'const char*' to 'unsigned char' [-fpermissive] 128 | Serial.println("%d",sensor[0]); | ^~~~ | | | const char* In file included from C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Stream.h:27, from C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/HardwareSerial.h:32, from C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Arduino.h:303, from C:\Users\conservator\AppData\Local\Temp\arduino\sketches\304EB848CF381B8A7A8E84D646752A81\sketch\mqttToAliyun.ino.cpp:1: C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Print.h:103:16: note: candidate: 'size_t Print::println(int, int)' (near match) 103 | size_t println(int, int = DEC); | ^~~~~~~ C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Print.h:103:16: note: conversion of argument 1 would be ill-formed: C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino:128:20: error: invalid conversion from 'const char*' to 'int' [-fpermissive] 128 | Serial.println("%d",sensor[0]);
时间: 2023-08-09 18:08:42 浏览: 162
这个错误是因为在你的代码中,`Serial.println()` 函数的参数传递方式不正确。`println()` 函数的第一个参数应该是一个字符串,而你传递了一个格式化字符串。正确的用法是使用 `Serial.print()` 函数来打印格式化字符串。以下是修正后的代码示例:
```cpp
Serial.print("%d");
Serial.println(sensor[0]);
```
这样就能正确打印传感器值了。记得在修改完代码后重新编译和上传到你的硬件设备上。
相关问题
C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino: In function 'void processData(char*)': C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino:120:26: error: invalid conversion from 'char' to 'const char*' [-fpermissive] 120 | value[0]=10*atoi(data[0]) | ~~~~~~^ | | | char In file included from c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\cstdlib:75, from c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\stdlib.h:36, from C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Arduino.h:27, from C:\Users\conservator\AppData\Local\Temp\arduino\sketches\304EB848CF381B8A7A8E84D646752A81\sketch\mqttToAliyun.ino.cpp:1: c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\stdlib.h:85:23: note: initializing argument 1 of 'int atoi(const char*)' 85 | int atoi (const char *__nptr); | ~~~~~~~~~~~~^~~~~~ C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino:120:28: error: expected ';' before 'Serial' 120 | value[0]=10*atoi(data[0]) | ^ | ; 121 | Serial.println(value[0]); | ~~~~~~ exit status 1 Compilation error: invalid conversion from 'char' to 'const char*' [-fpermissive]
根据报错信息,你在代码中有一个类型转换错误。`atoi()` 函数接受一个指向字符数组的指针作为参数,但你却将一个字符传递给了它。
在你的代码的第 120 行,你需要将 `data[0]` 作为指向字符数组的指针传递给 `atoi()` 函数。修正后的代码如下:
```arduino
value[0] = 10 * atoi(&data[0]);
Serial.println(value[0]);
```
请注意,`&data[0]` 表示 `data` 数组的第一个元素的地址,它是指向字符数组的指针,可以作为 `atoi()` 函数的参数。
另外,根据报错信息,你可能还需要包含 `stdlib.h` 头文件来使用 `atoi()` 函数。在你的代码中可能已经包含了这个头文件,但是报错信息中显示了一些 Arduino 内部的头文件,可能导致冲突。请确保只包含所需的头文件,并检查是否已正确引入 `stdlib.h`。
C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino: In function 'void mqttIntervalPost()': C:\Users\conservator\Desktop\mqttToAliyun\mqttToAliyun.ino:80:50: error: 'data' was not declared in this scope; did you mean 'std::data'? 80 | sprintf(param, "{\"CurrentTemperature\":%d}",data); | ^~~~ | std::data In file included from c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\array:41, from c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\tuple:39, from c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\functional:54, from c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\pstl\glue_algorithm_defs.h:13, from c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\algorithm:74, from C:\Users\conservator\AppData\Local\Arduino15\packages\esp8266\hardware\esp8266\3.1.2\cores\esp8266/Arduino.h:229, from C:\Users\conservator\AppData\Local\Temp\arduino\sketches\304EB848CF381B8A7A8E84D646752A81\sketch\mqttToAliyun.ino.cpp:1: c:\users\conservator\appdata\local\arduino15\packages\esp8266\tools\xtensa-lx106-elf-gcc\3.1.0-gcc10.3-e5f9fec\xtensa-lx106-elf\include\c++\10.3.0\bits\range_access.h:319:5: note: 'std::data' declared here 319 | data(initializer_list<_Tp> __il) noexcept | ^~~~ exit status 1 Compilation error: 'data' was not declared in this scope; did you mean 'std::data'?
根据错误信息,你在代码中使用了未声明的变量`data`,并且编译器建议你是否指的是`std::data`。为了解决这个问题,你需要在适当的位置声明并初始化`data`变量。
以下是一个示例,假设你要将温度数据存储在`data`变量中:
```cpp
void mqttIntervalPost() {
int data = getTemperature(); // 假设这是获取温度数据的函数
char param[50];
sprintf(param, "{\"CurrentTemperature\":%d}", data);
// 其他的代码逻辑...
}
```
请注意,这只是一个示例,你需要根据你的实际情况修改代码中的`getTemperature()`函数和数据类型。
如果问题仍然存在或者你需要更多帮助,请提供完整的代码以便更详细地分析和解决问题。
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