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how will this work?

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haylin1217

New Member
I am trying to build a simple electronic door lock which uses a CD4013 IC and the relay will respond after the correct sequence of 4 keys have been pressed.

Now here's my problem..

I wanted to connect a delay-pulse generator on that electronic door lock circuit. But the problem is I don't know how to connect those two circuits. I kept on simulating it on electronic workbench but I couldn't come up to a desired output.

here's the site where I got the schematic for the code lock.

https://www.electronicsforu.com/efylinux/circuit/jan2000/lockcir.gif

and here's the site where I got the schematic for the delay-pulse generator.

https://ourworld.compuserve.com/homepages/Bill_Bowden/555delay.gif

pls help me..

I still couldn't figure out till now how to connect those two circuits. thanks.
 

IT_Guru

New Member
See the little ball near the reset Pad connection? Connect the output of the 555 Delay to it thru a 1k resistor. Then set the delay pulse time. If the correct 4 numbers aren't input in the allotted time, the pad resets and you have to start over If you are looking for a delay on each of the keys being pressed, it gets a bit tougher. You'll have to use AND or NAND gates for each, with one common leg of each tied high/low, the other leg of each tied to the DELAY and the Keypad and the outputs of the AND/NAND going to the 4013s. EZ PZ
 
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