User enters a PIN code using the keypad. Arduino compares the input with a predefined password. If the PIN is correct: Relay activates for a few seconds. Lock opens temporarily, then re-locks. Relay ...

Keypad Input: The user enters the password using a 4x4 keypad. Password Verification: The entered password is compared to the preset password in the Arduino code. Servo Motor Action: If the password ...

[Andrea] just sent us this great student hack he made for his room. He’s constructed an Arduino keypad door lock — without using any proper fastening hardware! The entire build is made out of ...

So that’s more convenient. It is also faster to use than typing the code of the keypad door lock. Just place the finger and open the door.

Although the code is an entry-level one, it includes a secret key option that will need to be entered on the keypad. The Serial Monitor will tell whether the numerical-key inputted to the keypad is ...

In this project, we will learn about simple voltmeter by using Arduino. It is one of the best projects for beginners that uses basic concepts to measure voltage. When you run the Arduino code, you ...

What's really neat, though, is that he didn't mess with the lock mechanism in any way. The door stays locked at all times, and punching in the right keycode just turns the handle from the inside.

The Fingerprint Door Lock (FPDL) using Arduino with SIM800L research is designed to improve the security and convenience of door access control by integrating fingerprint recognition with Arduino and ...