arduino阿里云代码

以下是一个示例的Arduino与阿里云IoT平台通信的代码：

#include <WiFi.h>
#include <PubSubClient.h>

// WiFi网络参数
const char* ssid = "YourWiFiSSID";
const char* password = "YourWiFiPassword";

// 阿里云IoT平台参数
const char* broker = "YourBrokerURL";
const int port = 1883;
const char* clientId = "YourClientID";
const char* username = "YourAccessKey";
const char* password = "YourAccessSecret";
const char* topic = "YourTopic";

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  
  // 连接WiFi网络
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // 连接阿里云IoT平台
  client.setServer(broker, port);
  client.setCallback(callback);
  
  while (!client.connected()) {
    Serial.println("Connecting to MQTT...");
    if (client.connect(clientId, username, password)) {
      Serial.println("Connected to MQTT");
      client.subscribe(topic);
    } else {
      Serial.print("Failed, rc=");
      Serial.println(client.state());
      delay(2000);
    }
  }
}

void loop() {
  client.loop();
  
  // 发送数据到阿里云IoT平台
  String payload = "Hello from Arduino!";
  client.publish(topic, payload.c_str());
  delay(2000);
}

void callback(char* topic, byte* payload, unsigned int length) {
  Serial.print("Message received: ");
  
  // 打印接收到的消息
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

请注意，你需要替换代码中的以下参数为你自己的信息：

- `YourWiFiSSID`：你的WiFi网络的SSID
- `YourWiFiPassword`：你的WiFi网络的密码
- `YourBrokerURL`：阿里云IoT平台的MQTT Broker URL
- `YourClientID`：你的设备的客户端ID
- `YourAccessKey`：你的阿里云账号的Access Key
- `YourAccessSecret`：你的阿里云账号的Access Secret
- `YourTopic`：你的MQTT主题

此代码使用了WiFi库和PubSubClient库。确保在Arduino IDE中安装了这些库，然后将代码上传到你的Arduino板上。它将连接到WiFi网络，然后通过MQTT协议与阿里云IoT平台进行通信。每隔2秒，它会向平台发送一条消息，并通过串口打印接收到的消息。