arduino IDE编写esp8266调用mq-183的代码

以下是一个简单的Arduino IDE编写的ESP8266调用MQ-183的代码示例：

#include <ESP8266WiFi.h> //引入ESP8266的WiFi库
#include <PubSubClient.h> //引入MQTT客户端库

//定义WiFi连接参数
const char* ssid = "YOUR_SSID"; //WiFi SSID
const char* password = "YOUR_PASSWORD"; //WiFi密码

//定义MQTT服务器连接参数
const char* mqtt_server = "YOUR_MQTT_SERVER"; //MQTT服务器地址
const int mqtt_port = 1883; //MQTT服务器端口号
const char* mqtt_user = "YOUR_MQTT_USERNAME"; //MQTT用户名
const char* mqtt_password = "YOUR_MQTT_PASSWORD"; //MQTT密码
const char* mqtt_topic = "YOUR_MQTT_TOPIC"; //MQTT主题

//定义MQ-183引脚
int mq183_pin = A0;

//定义MQ-183的基准电阻值
float mq183_reference_resistance = 20.0;

//定义MQ-183的校准系数
float mq183_calibration_factor = 1.0;

//创建WiFi客户端和MQTT客户端
WiFiClient wifiClient;
PubSubClient mqttClient(wifiClient);

void setup() {
  //串口调试输出
  Serial.begin(9600);
  delay(10);

  //连接WiFi
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");

  //设置MQTT服务器
  mqttClient.setServer(mqtt_server, mqtt_port);
  mqttClient.setCallback(callback);
}

void loop() {
  //连接MQTT服务器
  if (!mqttClient.connected()) {
    reconnect();
  }
  mqttClient.loop();

  //读取MQ-183的电阻值
  int mq183_value = analogRead(mq183_pin);

  //根据MQ-183的电阻值计算出气体浓度
  float mq183_resistance = (1023 - mq183_value) * mq183_reference_resistance / mq183_value;
  float mq183_concentration = mq183_calibration_factor * pow(mq183_resistance / 7.5, -1.67);

  //将气体浓度发布到MQTT主题
  char mq183_concentration_str[10];
  sprintf(mq183_concentration_str, "%.2f", mq183_concentration);
  mqttClient.publish(mqtt_topic, mq183_concentration_str);
  Serial.print("MQ-183 Concentration: ");
  Serial.println(mq183_concentration);
}

void reconnect() {
  //尝试连接MQTT服务器
  while (!mqttClient.connected()) {
    Serial.print("Connecting to MQTT server...");
    if (mqttClient.connect("ESP8266Client", mqtt_user, mqtt_password)) {
      Serial.println("connected");
      mqttClient.subscribe(mqtt_topic);
    } else {
      Serial.print("failed with state ");
      Serial.println(mqttClient.state());
      delay(2000);
    }
  }
}

void callback(char* topic, byte* payload, unsigned int length) {
  //接收到MQTT消息时的处理函数
  Serial.print("Message arrived on topic: ");
  Serial.println(topic);
  Serial.print("Message: ");
  for (int i=0;i<length;i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
}

需要注意的几点：

• 在代码中需要替换掉YOUR_SSID、YOUR_PASSWORD、YOUR_MQTT_SERVER、YOUR_MQTT_USERNAME、YOUR_MQTT_PASSWORD和YOUR_MQTT_TOPIC为自己的WiFi和MQTT服务器参数。
• 在代码中还需要根据自己的MQ-183传感器的具体参数（如基准电阻值和校准系数）进行相应的修改。