NodeMCU DS18B20 Client

nodemcu_ds18b20_client.ino

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

#define ONE_WIRE_BUS 5 // nodemcu D1

OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);

const char* ssid = "mynetwork";
const char* password = "myappassword";
int refresh = 3;
String html = "<meta http-equiv=\"refresh\" content=\"" + String(refresh) + "\" />";

WiFiServer server(80);

void setup()
{
  Serial.begin(115200);
  delay(10);
  
  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");
  
  server.begin();
  Serial.println("Server started");
  
  Serial.println(WiFi.localIP());
  sensors.begin();
}

void loop()
{
  sensors.requestTemperatures();
  double celsius = sensors.getTempCByIndex(0);
  
  Serial.print("  Temperature = ");
  Serial.print(celsius);
  Serial.println(" Celsius, ");
  
  WiFiClient client = server.available();
  client.println("HTTP/1.1 200 OK");
  client.println("Content-Type: text/html");
  client.println("Connection: close");
  client.println();
  client.println(html + "<h1>" + String(celsius) + "</h1>");
  
  delay(refresh * 1000);
}