ds18b20.ino

#include <ESP8266WiFi.h>
#include <OneWire.h>
#include <DallasTemperature.h>

#define ONE_WIRE_BUS D3
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

const char* ssid     = "Minhyuk Nam의 iPhone";
const char* password = "ak4kh2sd2aun";

/*const char* ssid     = "MMlab1001";
const char* password = "mpeglab10";*/

const char* host = "api.thingspeak.com";
const char* streamId   = "....................";
const char* privateKey = ""; /*** 수정필요 ****/

void setup() {
  Serial.begin(115200);
  sensors.begin();
  delay(10);

  // We start by connecting to a WiFi network

  Serial.println();
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  /* Explicitly set the ESP8266 to be a WiFi-client, otherwise, it by default,
     would try to act as both a client and an access-point and could cause
     network-issues with your other WiFi-devices on your WiFi-network. */
  //WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print("WiFi not connected");
  }

  Serial.println("");
  Serial.println("WiFi connected");  
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

int value = 0;

void loop() {
  delay(60000);
  ++value;

  sensors.requestTemperatures();
  float strTemp=sensors.getTempCByIndex(0);
  
  Serial.print("connecting to ");
  Serial.println(host);
  
  // Use WiFiClient class to create TCP connections
  WiFiClient client;
  const int httpPort = 80;
  if (!client.connect(host, httpPort)) {
    Serial.println("connection failed");
    return;
  }

  String getStr = "GET /update?api_key=";
  getStr += privateKey;
  getStr += "&field3=";
  getStr += String(strTemp);
  
  Serial.print("Requesting URL: ");
  Serial.println(getStr);
  
  // This will send the request to the server
  /*client.print(String("GET ") + url + " HTTP/1.1\r\n" +
               "Host: " + host + "\r\n" + 
               "Connection: close\r\n\r\n");*/

  client.print(getStr + " HTTP/1.1\r\n" +
              "Host: " + host + "\r\n" + 
              "Connection: close\r\n\r\n");

  unsigned long timeout = millis();
  while (client.available() == 0) {
    if (millis() - timeout > 60000) {
      Serial.println(">>> Client Timeout !");
      client.stop();
      return;
    }
  }
  
  // Read all the lines of the reply from server and print them to Serial
  while(client.available()){
    String line = client.readStringUntil('\r');
    Serial.print(line);
  }
  
  Serial.println();
  Serial.println("closing connection");
}