Lets Get Started... Here we will setup the NodeMCU board and Blynk App for making projects based on IoT. Steps to Setup:- 1 . First Install the Arduino IDE in your PC. 2.Click on File and open Preferences. 3.Paste this link in URLs.(http://arduino.esp8266.com/stable/package_esp8266com_ index.json.). 4.Next Click on the Tools and select the Board Managers. 5.Search for ESP8266 and Install it. 6.Select the Board as NodeMCU 1.0 and also select the Port. 7.Write this code in the Arduino IDE. #define BLYNK_PRINT Serial #include <ESP8266WiFi.h> #include <BlynkSimpleEsp8266.h> char auth[] = "Your Auth Code"; // the auth code that you got on your gmail and Blynk app char ssid[] = "Username(WIFI)"; // username or ssid of your WI-FI...