This is a instructable for a very simple Arduino controlled electric lock.
The key idea here is to be very simple as this was more of a proof of concept prototype type of thing.
The Arduino is used as a switch to control the lock itself, and is set to interface with a Computer.
The Computer sends serial data to the Arduino in which allows the electronic lock to be opened.
The Computer itself allows many different ways of opening this lock such as just pushing a button, reading a bar code scanner, and even over Bluetooth with a Windows Mobile device.
I used this simple project as a fun way of learning the basics of a few different things,
such as Arduino programming, Bluetooth integration, Bar code scanners and Serial communication
The key idea here is to be very simple as this was more of a proof of concept prototype type of thing.
The Arduino is used as a switch to control the lock itself, and is set to interface with a Computer.
The Computer sends serial data to the Arduino in which allows the electronic lock to be opened.
The Computer itself allows many different ways of opening this lock such as just pushing a button, reading a bar code scanner, and even over Bluetooth with a Windows Mobile device.
I used this simple project as a fun way of learning the basics of a few different things,
such as Arduino programming, Bluetooth integration, Bar code scanners and Serial communication
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Signing UpStep 1: Parts
Well first you need a Arduino, i used a Diecimila but any type would work.
The lock i am using is La Gard ENV 1300 type lock, i bought like 6 of them for 10 bucks on EBay.
You can not use just any type of lock, like a regular door lock, it must be electronic based.
It needs to work in the following manner: Inside this lock is a deadbolt, now what keeps this deadbolt closed is a very simple electromagnet. When you put power through this electromagnet it allows the lock to be open. If it does not have this simple electromagnet inside then it will not work . A simple door lock that uses a key and pins and tumbler will not work.
I included a picture of the inside of the lock where you can see how it works: Power goes to the electromagnet which pulls back a pin that releases and frees a wedge. This wedge then allows the door to be unlocked.
Theoretically you could create your own electromagnetic lock, or use a simple motor or something but that is for a different instructable.
You will also need a basic transistor: I used a 2N2222 from radio shack
Now if you want to open it through other means than just the computer your need:
A Bluetooth phone, i am using a Touch Pro with Windows Mobile
A bar code scanner, i am using a Symbol CS1504
In the last picture you see a door knob, this door knob has a wooden square knob glued to the bottom to fit in the square peg on the lock, its used to open the lock.
The lock i am using is La Gard ENV 1300 type lock, i bought like 6 of them for 10 bucks on EBay.
You can not use just any type of lock, like a regular door lock, it must be electronic based.
It needs to work in the following manner: Inside this lock is a deadbolt, now what keeps this deadbolt closed is a very simple electromagnet. When you put power through this electromagnet it allows the lock to be open. If it does not have this simple electromagnet inside then it will not work . A simple door lock that uses a key and pins and tumbler will not work.
I included a picture of the inside of the lock where you can see how it works: Power goes to the electromagnet which pulls back a pin that releases and frees a wedge. This wedge then allows the door to be unlocked.
Theoretically you could create your own electromagnetic lock, or use a simple motor or something but that is for a different instructable.
You will also need a basic transistor: I used a 2N2222 from radio shack
Now if you want to open it through other means than just the computer your need:
A Bluetooth phone, i am using a Touch Pro with Windows Mobile
A bar code scanner, i am using a Symbol CS1504
In the last picture you see a door knob, this door knob has a wooden square knob glued to the bottom to fit in the square peg on the lock, its used to open the lock.
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Nick
This one looks like it has two but they might be different: http://www.ebay.com/itm/Lot-LaGard-Smart-Link-Electronic-Safe-Lock-Parts-Locksmith-/300655167002?pt=LH_DefaultDomain_0&hash=item460071c61a
same as above: http://www.ebay.com/itm/Lot-LaGard-Smart-Link-Electronic-Safe-Lock-Parts-Locksmith-/300655167023?pt=LH_DefaultDomain_0&hash=item460071c62f
I guess just keep checking for La gard locks: http://www.ebay.com/sch/i.html?_nkw=la+gard+locks
you could check with local locksmith and see if they have any of the lock units they dont want.
http://cgi.ebay.com/Gard-Combo-Guard-Electronic-lock-Kaba-Mas-3750-/120688325588?pt=LH_DefaultDomain_0&hash=item1c1995b3d4
not that many on ebay right not it seams:
http://cgi.ebay.com/SecuRam-Chrome-Electronic-Safe-Lock-LaGard-S-G-Amsec-/260738355156?pt=LH_DefaultDomain_0&hash=item3cb5378fd4
I guess just keep waiting and looking, what your paying most for is the keypad when we only need the lock, i guess you could contact them and ask if they would just sell you the lock.
we'll let you know what happened to our project when the right time comes..:)
I got the Arduino end of the Project, and the program is also simple, thanks for that. But i couldnt understand the Hardware part (The Lock part ) of the project. What actually going inside the lock is a bit fuzzy in my mind, can you please explain that in more detail.
Thanks in advance.
This lock i found on ebay, it i remember correctly is that it was used in a bank to secure the cash drawer.
How it works is that it has a dead bolt(the big grey bar sticking out) that is kept locked by a small gray wedge. This wedge has a hole in it, a pin is stuck through this hole and into a electro-magnent and a spring to keep the pin in place. When there is no power the spring pushes the pin through the hole in the wedge. The wedge then can not be open becouse the pin is in the way. But when given power the electro-magenet pulls the pin into the magents housing freeing the wedge so it can be unlocked. when power is removed the spring pushes the pin back into place with the wedge.
This lock though must be turned (the door knob in the pictures) to move the dead bolt, the dead bolt does not open on its own.
You can find a few like this on ebay, just make sure your buying the lock unit and not the keypad unless, your want the keypad. I got 4 of these for like 5 bucks.
BTW do you know the actual name of this door lock??
I found this lock, but dont know if its gonna work like your lock or not?
cgi.ebay.com/Slightly-Used-Schlage-Deadbolt-Door-Lock_W0QQitemZ280437876852QQcmdZViewItemQQptZLH_DefaultDomain_0
http://cgi.ebay.com/DAMAGED-HIGH-SECURITY-GUN-SAFE-ELECTRONIC-LOCK-LA-GARD_W0QQitemZ290381081936QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item439c0fad50
or
http://cgi.ebay.com/Lagard-3600-electronic-safe-lock_W0QQitemZ300378252492QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item45eff064cc
or
http://cgi.ebay.com/Lagard-3600-electronic-safe-lock_W0QQitemZ300378252446QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item45eff0649e
or
http://cgi.ebay.com/Sargent-Greenleaf-Used-Electronic-Safe-Lock-For-Parts_W0QQitemZ320462290269QQcmdZViewItemQQptZLH_DefaultDomain_0?hash=item4a9d0a7d5d
The lock i have is a La Gard ENV 1300
Firstly, thanks for sharing an excellent project, pretty neat and well done.
Just wondering however, as to are these the $8.99 locks that are found all over eBay now ? All of those other links do not show up, as they are obviously quite dated (9-10 months old).
cheers,
F74
Some EBay links:
http://cgi.ebay.com/LG-High-Security-Electronic-Lock-Keypad-Mod-3260-/280561484827?pt=LH_DefaultDomain_0&hash=item4152c4841b
http://cgi.ebay.com/AMSEC-ESL10-ELECTRONIC-SAFE-LOCK-/110585396489?pt=LH_DefaultDomain_0&hash=item19bf673d09
http://cgi.ebay.com/LAGARD-Electronic-lock-6-digit-CODE-3800-type-GUN-SAFE-/220667625063?pt=LH_DefaultDomain_0&hash=item3360d0be67
and maybe even this one
http://cgi.ebay.com/Diebold-Lubricated-Lock-17408A-Keyless-Electronic-NEW-/110582245802?pt=LH_DefaultDomain_0&hash=item19bf3729aa
and if all else fails i might have a few somewhere still
Hoping for your kind support in future
Thank you!
The signal from the Digital port is connected to the transistors base.
The power from the Arduino is going through the lock back out and to the collector on the transitor
Then it is going out the emitter to the Ground on the Arduino
Ill try and get a schematic up
L
L