基于ESP8266水质检测 （MQTT上报小程序和HA）

#include<ESP8266WiFi.h>
#include<PubSubClient.h>
#include<ArduinoJson.h>

// WiFi配置
constchar* ssid = "你的WiFi名称";
constchar* password = "WiFi密码";

// MQTT配置
constchar* mqtt_server = "MQTT服务器地址";
constint mqtt_port = 1883;
constchar* mqtt_user = "admin";
constchar* mqtt_password = "admin";
constchar* topic = "shuizhi"; #订阅主题

// 传感器配置
constint TDS_PIN = A0;  // ESP8266只能使用A0进行模拟输入
constfloat VREF = 3.3;  // 传感器工作电压
constfloat K = 0.4;     // 校准系数

WiFiClient espClient;
PubSubClient client(espClient);

voidsetup_wifi(){
  delay(10);
  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");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

voidreconnect(){
while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("esp8266-SZ", mqtt_user, mqtt_password)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

String getWaterQuality(float tds){
if (tds <= 9) return"优";       // 0-9 mg/L 纯净水
elseif (tds <= 60) return"优";  // 10-60 mg/L 山泉水、矿化水
elseif (tds <= 100) return"中"; // 60-100 mg/L 净化水
elseif (tds <= 300) return"中"; // 100-300 mg/L 普通自来水
elsereturn"差";                // >300 mg/L 可能存在污染
}

voidsetup(){
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
}

voidloop(){
if (!client.connected()) {
    reconnect();
  }
  client.loop();

// 读取并计算TDS值
int analogValue = analogRead(TDS_PIN);
float voltage = analogValue * VREF / 1024.0;
float tdsValue = (133.42 * pow(voltage, 3) - 255.86 * pow(voltage, 2) + 857.39 * voltage) * K;

// 获取水质等级
  String quality = getWaterQuality(tdsValue);

// 构建JSON数据
  StaticJsonDocument<200> doc;
  doc["TDS"] = round(tdsValue);  // 四舍五入取整
  doc["DJ"] = quality;

char jsonBuffer[512];
  serializeJson(doc, jsonBuffer);

// 发布MQTT消息
  client.publish(topic, jsonBuffer);

  Serial.print("Published: ");
  Serial.println(jsonBuffer);

  delay(5000);  // 5秒间隔
}

{"TDS":21,"DJ":"优"}

{"humi":58,"temp":36,"TDS":500,"DJ":"差"}