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Hi Everyone! Welcome To My Instructable!
My laser trip-wire security system employs a programmable combination lock that acts to arm and disarm the system, as well as indicate to the microprocessor if someone has entered in a faulty code (Tampering). There is also a really awesome and LOUD Siren with strobing indicator LEDs. The laser trip-wire is bounced across several carefully aligned mirrors and back to the laser detection circuit. The costs to create this project are pretty low. The only real cost is in the siren ($19) , the LS7222 ($6), and the keypad ($5).
Aligning the mirrors was the most difficult part, as I had to purchase sticky tack to stick them to the wall, and to be able to adjust the mirrors in different directions. The sticky tack kept moving over time, which made it extremely difficult. However, patience persevered, and I was able to get a nice video demonstration. I was able to purchase the Mirrors and the sticky tack at the local dollar store!
If there was more time, I would have added an extremely sensitive laser detection circuit, and a battery backup but instead I've added these schematics and instructions into the EXTRAS section so that you can use them in your future projects. I've posted three videos relating to this project::
1) A demonstration of my design with the mirror set-up that I have in my hallway.
2) A breakdown video of the electronics involved for those of you who don't want to have to read through the electronic block sections of this instructable.
3) A second up-close demonstration of the system with an explanation of the program algorithm.
I have worked extremely hard to offer as much detail as humanly possible regarding each aspect of the electronic hardware. I've included copies of thoroughly commented software, and a block diagram of the program algorithm.
For the better part, I don't expect anyone to fully re-create this project, but I have detailed so much information that the viewer will be able to use many blocks and schematics, or variations of them in their own projects. Thanks for viewing. As always, I appreciate your comments and perhaps your votes, if you find I deserve them =)
My laser trip-wire security system employs a programmable combination lock that acts to arm and disarm the system, as well as indicate to the microprocessor if someone has entered in a faulty code (Tampering). There is also a really awesome and LOUD Siren with strobing indicator LEDs. The laser trip-wire is bounced across several carefully aligned mirrors and back to the laser detection circuit. The costs to create this project are pretty low. The only real cost is in the siren ($19) , the LS7222 ($6), and the keypad ($5).
Aligning the mirrors was the most difficult part, as I had to purchase sticky tack to stick them to the wall, and to be able to adjust the mirrors in different directions. The sticky tack kept moving over time, which made it extremely difficult. However, patience persevered, and I was able to get a nice video demonstration. I was able to purchase the Mirrors and the sticky tack at the local dollar store!
If there was more time, I would have added an extremely sensitive laser detection circuit, and a battery backup but instead I've added these schematics and instructions into the EXTRAS section so that you can use them in your future projects. I've posted three videos relating to this project::
1) A demonstration of my design with the mirror set-up that I have in my hallway.
2) A breakdown video of the electronics involved for those of you who don't want to have to read through the electronic block sections of this instructable.
3) A second up-close demonstration of the system with an explanation of the program algorithm.
I have worked extremely hard to offer as much detail as humanly possible regarding each aspect of the electronic hardware. I've included copies of thoroughly commented software, and a block diagram of the program algorithm.
For the better part, I don't expect anyone to fully re-create this project, but I have detailed so much information that the viewer will be able to use many blocks and schematics, or variations of them in their own projects. Thanks for viewing. As always, I appreciate your comments and perhaps your votes, if you find I deserve them =)
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Signing UpStep 1Device Features + Demonstration
Design Features:
1) A combination lock circuit that employs the versatile LS7222 combination lock IC. The code can be re-programmed with ease using the matrix keypad. The same code is used to arm and disarm the system. If someone enters in an incorrect character, the tamper output pulses a warning to the microprocessor, and initiates the alarm sequence.
2) Two light sensing circuits. One of them is aimed at the ceiling, and indicates to the microprocessor whether or not there is enough light in the room for the system to work. After the ARM code in entered in, the system waits for the light to go out in the room before it enables the laser and starts scanning for a laser breach/tamper/or DISARM code to be entered into the keypad. Check out the program algorithm block diagram in step#9 for more information. The second light sensor is used to detect the laser beam.
3) The extremely loud EPIC siren with Strobing LEDs. This siren is activated by the microprocessor via a driver circuit. When the laser program is enabled, if someone breaks the beam that is being mirrored all over the doorway, the alarm is triggered. As well, if someone enters in an incorrect character.... ALARM. If the alarm goes off, the user must enter in the ARM/DISARM code to disable the program, and reset them system.
4) A 5mW red laser with a manual enable (Push button) and a software trigger/driver. We use the manual enable to align the laser through a series of mirrors, and back to the laser detection light sensor circuit. Once we've done that, we turn the laser off, and enable the system. From there, the software will dictate when the laser is turned on or off. See Step#6 (Laser electronic Block).
5) The microprocessor is a PIC18F1220 from Microchip Technologies. It takes the signals from the light sensors and the combination locks, and outputs signals to the on-board piezo buzzer indicator, the siren, and acts to enable/disable the 5mW laser.
6) Please note that I've added in some fun extras in the EXTRAS section, such as how to employ a battery backup, and how to make an extremely sensitive laser detector.
Here is the first of three videos. This video is the mirror demonstration. See Step#2 for the video version of the electronic summary, and Step#9 for an up close demonstration with a program algorithm discussion.
1) A combination lock circuit that employs the versatile LS7222 combination lock IC. The code can be re-programmed with ease using the matrix keypad. The same code is used to arm and disarm the system. If someone enters in an incorrect character, the tamper output pulses a warning to the microprocessor, and initiates the alarm sequence.
2) Two light sensing circuits. One of them is aimed at the ceiling, and indicates to the microprocessor whether or not there is enough light in the room for the system to work. After the ARM code in entered in, the system waits for the light to go out in the room before it enables the laser and starts scanning for a laser breach/tamper/or DISARM code to be entered into the keypad. Check out the program algorithm block diagram in step#9 for more information. The second light sensor is used to detect the laser beam.
3) The extremely loud EPIC siren with Strobing LEDs. This siren is activated by the microprocessor via a driver circuit. When the laser program is enabled, if someone breaks the beam that is being mirrored all over the doorway, the alarm is triggered. As well, if someone enters in an incorrect character.... ALARM. If the alarm goes off, the user must enter in the ARM/DISARM code to disable the program, and reset them system.
4) A 5mW red laser with a manual enable (Push button) and a software trigger/driver. We use the manual enable to align the laser through a series of mirrors, and back to the laser detection light sensor circuit. Once we've done that, we turn the laser off, and enable the system. From there, the software will dictate when the laser is turned on or off. See Step#6 (Laser electronic Block).
5) The microprocessor is a PIC18F1220 from Microchip Technologies. It takes the signals from the light sensors and the combination locks, and outputs signals to the on-board piezo buzzer indicator, the siren, and acts to enable/disable the 5mW laser.
6) Please note that I've added in some fun extras in the EXTRAS section, such as how to employ a battery backup, and how to make an extremely sensitive laser detector.
Here is the first of three videos. This video is the mirror demonstration. See Step#2 for the video version of the electronic summary, and Step#9 for an up close demonstration with a program algorithm discussion.
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I'm wondering if you can add more items to the security system like another matrix pad OR another laser... so when you have time give me a comment.
Thank you for your time!
Dakota S.
With my Surefire I was able to stand 50ft away and still break the beam without setting the alarm off.
A project like this shows me that it is possible, with a little application, to create an inexpensive and relatively "low tech" solution.
Thanks for the sharing the ideas.
Just wanted to say I love this project, I think it is awesome. In fact, I am trying to built your instructables just without the siren, and only using an piezo alarm. I just want to see if I can build it, and get it to work! I just hope if I run into any snags, that I could count on your expertise to help me along the way. Thank you for all the infomation you already have here. Hope to get it to work.
Thanks,
Shrike4
Sure =) Send me a message if you get stuck. I'll do my best to help.
Sincerely,
Pat
Do you think you could send me a list or sell a DIY project for this i want it for my bedroom. i also have no experience on doing this so if you could make a video of you bulding one step by step or put it all in plain english in an instuctable i would greatly appreciate it..
Chandler
i will email you my email adress if you have an email i dont want to put it out in public
this is (sam)
its a great project for me because im a student from India i want to make this project so can u please give some information about (he Program (PIC18F1220) ASM Code) and tell me how can i do this please and yes tell me what is the price of the device please .................................I'm not a engineer but i still want make this project so please give more information as u can and help me to make this u can send detail to (sonu007adak@gmail.com) or u can post here.........
Thank You .....
I work full time and do this as a hobby, so I don't have a lot of time to spare. If you can simplify your request, I can likely help you out, but I can't go through everything with you. You'll have to just do your best to follow along with the instructable =s
Thank you for your kind comment.
Pat
thanks for your reply . i'm just want to know about this device where i can buy it and how its work and its really important for this project and there have not any way to complete this project ?
thanks for your timing
Sam
I only have one question, do you have a diagram of the complete circuit on one picture? if so, could you please PM me, or email. Thanks!
Thanks! There is a picture in the instructable of the entire circuit. I do not have a parts list on hand, but the meat of the circuit is the LS7222, the keypad, the siren, the laser, and the light sensors. I have some of these for sale if you're interested.
Go to www.electroniclessons.com or engineeringshock.com
Thanks
Pat
The link for the siren in in the siren driver electronic block. They are so much louder than what you see in the video!
Thanks!
Pat
I realize that it may be more detailed than it had to be, but I wanted to give as much info as posible. I hope that when you're done making yours, that you post it and send me the link =)
Thanks again!
Pat
well can you try this with infrared beam of light.. i guess that would be a more "SECURE "security system..?
nice instructable anyways!
I went to school to be an electronics technician. They gave me the tools, but if you have the passion for electronics, you have to keep building and learning as you go. There are hundreds of great websites online that could get you started. For instance, if you search "breadboard explanation" you'll see a ton of sites come up. A breadboard is a prototyping board that allows for you to take out and put in components, as opposed to soldering them into a PCB. Have a look around. There are TONs of great references on the internet. If you want help finding a good place to start, I am more than happy to help =)
Sincerely
Pat
Let's start from the beginning: By "to" I'm sure you meant "too". Granted, both to and too are parts of English language, but with stark differences. To is used as a preposition, while too is used as an adverb. (Fail 1)
And by "complicted" I'm reasonably sure you meant "complicated"...as the spell check tried to tell you, but you so brazenly ignored. (Fail 2)
Lastly, if you're going to leave comments, you should start by being constructive...and, preferably, grammatically correct. Surely you can see how your extensive grammatical fail retracts from your otherwise deluded opinion of this awesome instructable.
If the reason for your atrocious grammar is that this instructable just blew your mind, you are forgiven, but for no other reason.
oh my god, i wish i had known that for when i did my electronics a level coursework (which btw was a security system like this). instead i made a switch multiplexing grid whcih connected different resistors together for each switch pressed - 3 analogue outputs (one for each row of switches) feeding into a microcontroller with 3 adc's (picaxe 18x). this would have been so much simpler, and the picaxe was really temperemental as well :(
really good instructable - i like how much detail you went into
(and to all the people saying this is complicated you should have seen my coursework - it took up 17 breadboards, mainly due to the ram memory i made from flipflops)
I know what you mean. I created a few manual combination locks in school. One employed only HW (JK flip flops in toggle configuration, and several X-OR gates.
I want to do what you did using the ADCs and doing comparing through programming. Thanks again for the comment. I tried to put as much detail into this as I could, and it is really nice to get comments like this.
Thanks again!
Pat
Thanks! With the sensitive laser circuit I designed and placed in the EXTRAS section, you can do just that. There is an extra video in the EXTRAS section that I added to show how to modulate audio on a laser. This would be a great idea, and it would only require a small change to the hardware, and a perhaps a few changes to the SW. I'd add a counter subroutine that counted the pulses and did a compare.
One thing though, if the intruder tried to re-direct the laser,the alarm would go off. In the darkness, if the laser was re-directed after the scanning mode started, ALARM!
=) Thanks again for the comment. It would be a great idea to play around with!
Though when i watched the video I may have laughed a bit at one point...
aboot.... he he he. You silly Canadians.
Thanks for the comment!
I myself, have am an expert with an interest in Micro-controllers.
Here's a little bit of my opinion: You are making this quite more advanced than what it needs to be.
But other than that, good work!!!! I will surely vote for you pal