ELECTRONICS & EMBEDDED
Keypad Digital Door Lock
Build a keypad-controlled lock model with password validation and servo latch.
LevelSchool / Intermediate
Duration2–3 Weeks
Components₹1,500–₹2,800 CodingMedium
Project overview
Build a keypad-controlled lock model with password validation and servo latch.
Build a keypad-controlled lock model with password validation and servo latch.
Components / materials required
✓Arduino
✓4x4 keypad
✓Servo motor
✓Buzzer
✓LCD/OLED
✓Model door
What the project demonstrates
✓PIN entry
✓Lock/unlock servo
✓Wrong-attempt alert
✓Changeable code
Suggested build plan
01
Keypad input
Read key presses.
02
PIN logic
Validate entered code.
03
Servo lock
Control latch position.
04
Feedback
Show status and wrong attempts.
Learning outcomes
✓Use matrix keypad input
✓Implement simple authentication
✓Control servo actuators
✓Build security-system logic