Blynk IoT (Blynk 2.0) App w/Arduino Uno R3, ESP8266 ESP-01 Module, Blynk Cloud & 4 x LED [TUTORIAL]

Note (18/6/2022): Seen at 4:33, the AT command for checking UART/Baud Rate on your ESP8266 ESP-01 only appears to work if the module is flashed with SDK 2.x or above. In other words, if your module has the older 1.3.0 SDK the 'AT+UART?' command will simply give an 'ERROR' message on the serial monitor. However, you can still set the UART/Baud Rate using 'AT+UART=38400,8,1,0,1' regardless of which SDK your module has. If you're not sure which SDK version your ESP8266 ESP-01 module has, simply type 'AT+GMR' in the Serial Monitor and it will tell you.

Note (8/5/2022): We are using Blynk IoT / 2.0 and NOT the deprecated Blynk Legacy. The ESP8266 ESP-01 module should be set to 38400,8,1,0,1 (from the default 115200,8,1,0,1) for UART/Baud Rate. More information on Chapter 4. Links and video chapters etc are listed below. GOOD LUCK!

Important Links/Resources:
======================
Fritzing Diagram: https://drive.google.com/file/d/1l8Yh...
Arduino IDE Code: https://drive.google.com/file/d/13uvT...
Blynk Library v1.0.1 (scroll down to 'Blynk_Release_v1.0.1.zip'): https://github.com/blynkkk/blynk-libr...
Blynk Cloud: https://blynk.cloud
Blynk IoT for iOS: https://apps.apple.com/us/app/blynk-i...
Blynk IoT for Android: https://play.google.com/store/apps/de...
Blynk Example Browser: https://examples.blynk.cc

Video Chapters:
=============
0:00 - 1. Introduction
0:36 - 2. Fritzing Diagram
1:38 - 3. Device Components for 4-LED IoT Device
2:52 - 4. Setting UART/Baud Rate of ESP-01 Module
5:40 - 5. Building the 4-LED IoT Device
14:49 - 6. Signing up for a new Blynk / Blynk Cloud account
16:30 - 7. Creating a template (Datastreams & Web Dashboard) on Blynk Cloud
23:19 - 8. Setting up Mobile Dashboard w/Developer Mode on Blynk IoT smartphone app
27:30 - 9. Creating Code for 4-LED IoT Device #1 (Blynk Example Browser & Arduino IDE)
29:13 - 10. Creating a New Device on Blynk Cloud
30:43 - 11. Creating Code for 4-LED IoT Device #2 (Blynk Example Browser & Arduino IDE)
33:33 - 12. Installing Blynk Library (for ESP8266_Lib.h) to Arduino IDE
35:30 - 13. Uploading Code to 4-LED IoT Device
35:53 - 14. Testing WiFi/Blynk Connection of Device via. Serial Monitor
36:29 - 15. Testing Device w/Blynk IoT App & Blynk Cloud Web Dashboard
39:35 - 16. End

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