Security is the main challenging things in this modern world . Any one can enter your private home at any time to stole your property . To protect your home from thief you must be secured . In this project a motor is fitted to the door so that door will open only when password is matched .
By doing this project you will also know concept behind relay . Since relay is mechanical switch between very high voltage controlled by 3 or 5 volt using npn transistor .
connect your hardware as shown in circuit diagram above and now upload hex file generated from below code to the arduino uno board .
The key pad library for the arduino uno available in this link Keypad .This library is setup to do every function for the keypad .
The simulation file for proteus 8 with arduino code can be downloaded from this link proteus simulation with code
This is very simple project . If you did not understood code please learn first AVR and it will be easy for you to understand arduino codes . you can learn AVR from this link https://www.electronify.org/learn-microcontrolleravr
If you have any question or suggestion please comment below and do not forget to share this project .