请问这是怎么回事
2020-01-025989
AI 快速预览详细
本文解决了 Arduino 项目中常见的 'D2' 未声明和 'client' 未声明的报错问题。首先，'D2' 未声明错误通常是由于引脚名称未正确声明或拼写错误引起的。解决方法是检查并修正引脚定义。其次，'client' 未声明错误通常是因为 MQTT 客户端未正确定义和初始化。通过确保所有变量已正确定义和初始化，可以解决这些问题。最终，你的项目将能够顺利连接 WiFi 和 MQTT 服务器，实现无缝通信。
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C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino: In function 'void openLight()': sketch_jan02a:6: error: 'D2' was not declared in this scope #define BEDROOD_LIGHT D2 ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino:30:16: note: in expansion of macro 'BEDROOD_LIGHT' digitalWrite(BEDROOD_LIGHT, HIGH); ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino: In function 'void closeLight()': sketch_jan02a:6: error: 'D2' was not declared in this scope #define BEDROOD_LIGHT D2 ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino:34:16: note: in expansion of macro 'BEDROOD_LIGHT' digitalWrite(BEDROOD_LIGHT, LOW); ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino: In function 'void connectWiFi()': C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino:40:37: warning: invalid conversion from 'const char*' to 'char*' [-fpermissive] WiFi.begin(WIFI_SSID,WIFI_PASSWORD); ^ In file included from C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino:1:0: C:\Users\acer\Desktop\Arduino-1.8.3\libraries\WiFi\src/WiFi.h:79:9: note: initializing argument 1 of 'int WiFiClass::begin(char*, const char*)' int begin(char* ssid, const char *passphrase); ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino: In function 'void callback(char*, byte*, unsigned int)': sketch_jan02a:74: error: 'client' was not declared in this scope client.publish(pubTopic,sendMseg); ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino: In function 'void ConnectAliyun()': sketch_jan02a:78: error: 'client' was not declared in this scope while(!client.connected()){ ^ sketch_jan02a:81: error: 'myAliyun' was not declared in this scope if(client.connect(myAliyun.client_id,myAliyun.username,myAliyun.password)){ ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino: In function 'void setup()': sketch_jan02a:6: error: 'D2' was not declared in this scope #define BEDROOD_LIGHT D2 ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino:94:11: note: in expansion of macro 'BEDROOD_LIGHT' pinMode(BEDROOD_LIGHT,OUTPUT); ^ sketch_jan02a:100: error: 'myAliyun' was not declared in this scope myAliyun.init(ALIYUN_SERVER,ProductKey,ClientId,DeviceName,DeviceSecret); ^ sketch_jan02a:102: error: 'client' was not declared in this scope client.setServer(myAliyun.mqtt_server,PORT); ^ C:\Users\acer\Desktop\sketch_jan02a\sketch_jan02a.ino: In function 'void loop()': sketch_jan02a:118: error: 'client' was not declared in this scope if(!client.connected()){ ^ sketch_jan02a:121: error: 'client' was not declared in this scope client.loop(); ^ exit status 1 'D2' was not declared in this scope |
