[7편] 욕실 습도 - DHT22로 곰팡이 예방 센서

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <DHT.h>

const char* ssid     = "IoT_Hub_Net";
const char* password = "iothub1234";
const char* hubURL   = "http://192.168.1.1";

#define DHTPIN  5
#define DHTTYPE DHT22
#define SLOT_NO 19     // 두뇌 19번 슬롯 = Bath Hum
#define INTERVAL 30000

DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(115200);
  dht.begin();
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  Serial.print("Connecting to IoT_Hub_Net");
  while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); }
  Serial.println("\nConnected!");
}

void loop() {
  float hum = dht.readHumidity();
  if (isnan(hum)) { Serial.println("Read failed"); delay(2000); return; }

  Serial.print("Bath Hum: "); Serial.print(hum); Serial.println(" %");

  WiFiClient client; HTTPClient http;
  String url = String(hubURL) + "/set?no19=" + String(hum);
  http.begin(client, url); http.GET(); http.end();
  Serial.println("HTTP -> " + url);
  delay(INTERVAL);
}