物联网温湿度监测站项目

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

#define DHTPIN 4
#define DHTTYPE DHT22

DHT dht(DHTPIN, DHTTYPE);
WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  dht.begin();
  WiFi.begin("SSID", "PASSWORD");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  client.setServer("mqtt.example.com", 1883);
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  
  if (!isnan(h) && !isnan(t)) {
    if (!client.connected()) {
      client.connect("monitor_01");
    }
    client.publish("sensor/temp", String(t).c_str());
    client.publish("sensor/humi", String(h).c_str());
  }
  delay(2000);
}