Coding a program to send the sensed temperature to the internet

Now, we need to develop the software for connecting the temperature sensor to the internet using the ESP8266 Wi-Fi module. Let's begin:

1. Open the Arduino menu and select Preferences.
2. Add https://arduino.esp8266.com/stable/package_esp8266com_index.json to the Additional Boards Manager URLs field. You will need to separate the text with a comma from the link of the STM32 module that we installed in the first chapters.
3. Install the esp8266 platform. Go to the Tools menu and select Board followed by Boards Manager (see Figure 9.16):
   

   Figure 9.16 – Installing the esp8266 platform

4. Including the libraries will be the first step in the code:

   #include <DallasTemperature.h>
   #include <ESP8266WiFi.h>
   #include <ESP8266WebServer.h>

5. setup() will contain all the programming logic. We need to start the serial data transmission and assign the speed of the transfer (this time we will use 115...