Password Protected Door Lock Circuit

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This is an intriguing DIY detailed instruction tutorial on “Electronic Door Lock Password Security Circuit” ‎using IRF540 MOSFET. It can use as a security check system to constrain access to only certain people ‎with security codes.

The fundamental standard of this circuit is that the door lock only opens when the switches in ‎series are squeezed at a time. However, if any switch other than the password key switches is pressed, the circuit resets itself. Meanwhile, if the switches in series are pressed in order, the capacitor turned on the relay which consequently opens the electronic lock.

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5$ PCB Prototype

https://youtu.be/obYApI_m1SE

Hardware Components

The following components are required to make Password Security Doorlock Circuit

S.no	Component	Value	Qty
1.	MOSFET	IRF540	1
2.	Diode	1N4007	1
3.	Capacitor	10V/470µF	4
4.	Relay	5V	1
5.	Zero PCB	–	1
6.	LED	–	1
7.	Resistor	470Ω	1
8.	Switch	–	9
9.	Battery	9V – 12V	1

IRF540 Pinout

For a detailed description of pinout, dimension features, and specifications download the datasheet of IRF540

Password Security Doorlock Circuit

Working Explanation

The password security door lock circuit operates in a manner that, when I press the first switch, the first capacitor will take charge from the power source or battery. And when I press the second switch, the half charge of the first capacitor will transfer to the second capacitor. This cycle will run up to the last capacitor of the circuits. Hence, the fourth capacitor activates the 5V relay which consequently unlocks the electronic lock.