Door electronic lock with Keypad

Posted on Jun 17, 2012

It is a relatively simple circuit of electronic lock of safety with code of 7 digits. It should is given attention in the time that will be stepped the keys, that shape code and it does not exist it delays. With the right step of keys and if code is right then is activated exit Q7 for roughly 4 seconds, driving the transistor Q2, which with the line can drive one relay, for the opening of door, or any other circuit. With LED D we can have optical clue of activation. The code of circuit, as it has been given have been:1704570 but can change, if we change the connections between in the exits of IC1 and the switches.

Door electronic lock with Keypad
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Part List R1-7=4.7Kohm R12=220Kohm D3=RED LED 3mm R8=15Kohm R14=1.2Kohm IC1=4022 R9=1Mohm C1-3=100nF 100V Q1=BS170 R10-13=10Kohm C2=4.7uF 25V Q2=BD679 R11=100ohm D1-2=1N4148 S1-10=Push button or keyboard

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