Home Assistant 구축기 - ESP32편

간단하게 온습도 센서만 부착했다.

구매링크

보드
온습도

#include <WiFi.h>         //WIFI shield
#include <PubSubClient.h>

 #include<DHT.h> //DHT.h 라이브러리 추가
DHT dht(13, DHT11); //DHT 설정 dht(핀, DHT종류)
 
char ssid[] = "";
char password[] = "";
const char* mqtt_server = "";

char nickname[] = "";
char mqtt_id[] = "";
char mqtt_pw[] = ";
unsigned long timer = 0;
WiFiClient espClient;
PubSubClient client(espClient);
 
void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
 
  WiFi.begin(ssid, password);
 
  while (WiFi.status() != WL_CONNECTED) {
    for(int i = 0; i<500; i++){
      delay(1);
    }
    Serial.print(".");
  }
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
 
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    if (client.connect(nickname,mqtt_id,mqtt_pw)) {
      Serial.println("connected");
       
       
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
      // Wait 5 seconds before retrying
    }
  }
}
 
void setup() {
  Serial.begin(115200);
  setup_wifi();
  dht.begin();
  client.setServer(mqtt_server, 1883);
   
}
 
void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  
  unsigned long now = millis();
  if(now - timer > 30 * 1000){
    timer = now;
    float tem = dht.readTemperature(); //온도 값 정수형 변수 tem에 저장 
    float hum = dht.readHumidity(); //습도 값 정수형 변수 hum에 저장
    char cStr[6];       // number of digits + 1 for null terminator
    dtostrf(tem,5,2, cStr);  // int value, pointer to string, base number
    client.publish("iot/temperature", cStr);
    dtostrf(hum,5,2, cStr);  // int value, pointer to string, base number
    client.publish("iot/humidity", cStr);
    Serial.println(tem);
    Serial.println(tem);
  }
   
}