4x4 Keypad Door Lock using NodeMCU with E-Mail Alert

Hi! This project is a 4x4 keypad code lock using NodeMCU. We can send E-Mail alerts to the owner or the specified recipient if the code is incorrectly entered three times in a row. Save all the files in a single folder. Compile and run the .ino file on the NodeMCU using the Arduino IDE. To enter the code, press "*" To confirm the code, press "A" To change the existing code, press "#" and then follow the steps.