esp8266采集光照强度上报

以下是ESP8266采集光照强度并上报的示例代码：

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <Wire.h>
#include <BH1750.h>

// WiFi信息
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";

// MQTT信息
const char* mqtt_server = "your_MQTT_SERVER";
const char* mqtt_username = "your_MQTT_USERNAME";
const char* mqtt_password = "your_MQTT_PASSWORD";
const char* mqtt_topic = "your_MQTT_TOPIC";

// BH1750传感器
BH1750 lightMeter;

// WiFi客户端
WiFiClient espClient;

// MQTT客户端
PubSubClient client(espClient);

void setup() {
  // 初始化串口
  Serial.begin(115200);

  // 初始化BH1750传感器
  lightMeter.begin();

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

  // 连接MQTT服务器
  client.setServer(mqtt_server, 1883);
  while (!client.connected()) {
    Serial.println("Connecting to MQTT server...");
    if (client.connect("ESP8266Client", mqtt_username, mqtt_password)) {
      Serial.println("Connected to MQTT server");
    } else {
      Serial.print("Failed with state ");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void loop() {
  // 读取光照强度
  float lux = lightMeter.readLightLevel();

  // 将光照强度转换为字符串
  char luxStr[10];
  dtostrf(lux, 4, 2, luxStr);

  // 发布MQTT消息
  client.publish(mqtt_topic, luxStr);

  // 等待5秒钟
  delay(5000);
}

该示例代码使用了BH1750传感器来读取光照强度，并使用MQTT协议将光照强度上报到指定的MQTT主题。在代码中，你需要将WiFi信息、MQTT信息和MQTT主题替换为你自己的信息。此外，你还需要在Arduino IDE中安装BH1750库、PubSubClient库和ArduinoJson库。