物联网（IoT）设备数据采集与推送

// 读取温度传感器数据并存储
#include <DHT.h><p>DHT dht(DHTPIN, DHTTYPE);</p><p>void setup() {
Serial.begin(9600);
dht.begin();
}</p><p>void loop() {
float temperature = dht.readTemperature();
if (isnan(temperature)) {
Serial.println("Failed to read from DHT sensor!");
return;
}</p><p>// 存储温度数据
storeTemperature(temperature);</p><p>delay(2000); // 每2秒读取一次
}</p><p>void storeTemperature(float temp) {
// 在这里实现将温度数据存储到缓冲区的逻辑
// 例如：temperatureBuffer.add(temp);
}</p>

// 使用MQTT推送温度数据
#include <PubSubClient.h>
#include <WiFi.h><p>const char<em> ssid = "your_SSID";
const char</em> password = "your_PASSWORD";
const char* mqtt_server = "example.com";</p><p>WiFiClient espClient;
PubSubClient client(espClient);</p><p>void setup_wifi() {
delay(10);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
}
}</p><p>void reconnect() {
while (!client.connected()) {
if (client.connect("ESP8266Client")) {
// 连接成功
} else {
delay(5000);
}
}
}</p><p>void setup() {
setup_wifi();
client.setServer(mqtt_server, 1883);
}</p><p>void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();</p><p>float temperature = getTemperature(); // 假设我们有一个函数来获取温度
char tempString[8];
dtostrf(temperature, 1, 2, tempString);
client.publish("temperature", tempString);
delay(5000); // 每5秒推送一次
}</p>