Electronic Door Lock Security Key

Digital Electronic Door Lock Security Key Circuit

This is the circuit diagram electronic door lock security key system. It means that this security system circuit is the combination of pressed key itself (not the mechanical). The output can be connected to drive the relay to open the door (usually using motor).

It is a quite simple circuit of electronic door lock with security code of 7 digits. Attention must be paid in time we pressed the keys forming the code and there is no delay. With the right keys and if the correct code will activate the output Q7 for about 4 seconds, driving the transistor Q2, which can be used to activate a relay and opening the door, or can be used for any other circuit. The LED used for visual indication of activation. The seven-digit combination code of the above circuit is: 1704570, but can be changed the combination of secure key by exchange the connections between the outputs of the counter IC1 and switches.

Electronic Door Lock Security Key Components List

R1,R2,R3,R4,R5,R6,R7 = 4.7Kohm
R8 = 15Kohm
R9 = 1Mohm
R10,R13 = 10Kohm
R11 = 100ohm
R12 = 220Kohm
R14 = 1.2Kohm
C1,C3 = 100nF/100V
C2 = 4.7uF/25V
Q1 = BS170
Q2 = BD679
IC1 = 4022
D1-2 = 1N4148
D3 = RED LED 3mm
S1-10 = Push button or keyboard

7 thoughts on “Electronic Door Lock Security Key

  1. Muhammad Taha Sikander

    This circuit is useful for me & this will be very surprising to me to make your circuit myself.I would be very thankful to you to upload the circuit on website.

  2. circuit diagram Post author

    I’m sorry i forgot to give the part list. It should be clear now.. 🙂

  3. alexander kyereh

    pls send me the components of the circuit.Thanks

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