File -> Examples -> Blynk -> Boards_WiFi -> NodeMCU
Tools -> Boardmenu, select
NodeMCU 1.0 (ESP-12E Module)
Verifybutton and make sure that example compiled correctly:
Uploadbutton. (You should see a progress bar in the console, followed by Done uploading message in the status panel. After this process is finished, LED should start blinking blue: which means the board is waiting for configuration).
Error opening serial port...If you get this error, you need to set serial port permission. Open terminal, and run command: