Arduino password protected door lock system
It is a password protected door lock project using arduino Press # for clear then press the password ( in my case it is 1234) and press * (star) for confirm. now servo motor on and door lock will open .after 5 sec it will automatically close. Parts need- arduino uno 4x4 Matrix keyboard servo motor jumper wire power bank or battery for power supply bread board normal door lock resistor 220 ohms Connection - key pad pin Arduino digital pin 1 to 9 2 to 8 3 to 7 4 to 6 5 to 5 6 to 4 7 to 3 8 to 2 green led to arduino digital pin 11 red led to arduino digital pin 12 led ground via 220 ohom resistor servo signal to arduino digital pin 13 Connection Diagram