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Thread: Ambitious Video Security System

  1. #191
    Constant Bitrate
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    Sorry I have bee so quite lately. I have had a nasty cold, sinus infection, etc.. since last Friday.

    Anyway, here's some updates:

    I got the VC-C4 camera today and holy ***** is it nice! It can focus on small type on a piece of paper placed AGAINST the lens. We're talking like 1/4 of an inch. It doesn't seem to like low light a whole lot, but there are settings in the camera to control exposure. I do not have the remote and just got it today so I have not built a serial cable for it yet. I will report on it a bit more when I get a chance to really try it out.

    I decided to pick up the data transceivers ($66 for 1 TTL module and 1 RS232 module.) While I was at it, I grabbed two different removeable 2.5" drive racks. I am hoping to modify one of them for my DVR. I am not sure exactly how I am going to do it yet. I may still end up building my own rack for it.

    I have a pretty good understanding of what I need to do with the AVR to emulate the remote controls. I need to find some time to experiment a bit. I am considering throwing it in an 8 pin AVR and using it as a seperate module. This will then be more useful for future projects where I want to do IR. The idea would be to store a number of codes, and then use the remaining I/O pins to select which remote code to transmit from a table. I am also considering streaming the device and command code (16 bits) I want to encode and then letting the module do the work. I'll decide once I start actually experimenting with it.

    I also picked up 100 Side emitting IR LEDs. Why 100? Well, this is how I work. When I need some part I don't already have, I figure I will probably need that same part again some time in the future. So I never buy just one. I get the largest quantity I can reasonably justify buying. When I get in groove building something, I really hate having to stop and order something and wait for it to arrive before I can continue.

    That's it. Sorry it wasn't all that exciting.

  2. #192
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    I always buy extra's & I too hate to build with a one off or junk bin parts also thinking about servicabilty...., if I only have one & it's obscure, I'd rather go out & buy something else that I know I can get if I ever need to duplicate or repair/replace

  3. #193
    Newbie
    Join Date
    Apr 2006
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    30
    Just like to say I'm having a great time reading this thread, most of it goes well over my head, since I just about know how to solder and what most components are on a circuit board and little else, but one day (probably just before I attempt something similar) I'll sit down and try and work through everything.

    Anyway, keep up the work, can't wait to see it finished and working!

  4. #194
    Constant Bitrate
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    Thanks, jammy, I appreciate that.

    I have a tendency to get a little excited about the geek details. You will notice that after I spew a bunch of it (and it has changed a ton of times throughout this thread, so you can ignore a lot of it anyway) that I try to provide a summary.

    Whatever I come up with in the end will be provided open source, open hardware. So anyone with the capability or has access to the capability can build one or improve on it. Building it is (relatively) easy, designing it is the hard part and that will already be done.

  5. #195
    Constant Bitrate
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    Odd...I thought I posted this already:

    After designing the switching power supply and then going out to source parts, I realized how much of a PITA it was going to be getting the exact coils and dealing with the layout of the PCB to ensure it will be noise free and stay within safe limits. So I got lazy.

    I found a great deal on 11x 5V@3A (15W) switching supply modules. Digikey sells them for about $18, I picked up the 11 part lot for just over $40 including shipping. I only need 2 of them in this project. One for the DVR and 1 for all other 5V needs (controller, logic, data transceiver, and video transmitter.) These modules take an input between 9v to 30V and have shutdown capabilities. Over 90% efficiency and about 100uA shutdown current. It comes in a 12 pin SIP package with heatsink mounting. Made by Texas Instruments. These are obviously going to be way better than what I can come up with and even at $18 they are cheaper than it would cost me to build them in time and materials.

    So call it lazy or, as I prefer, call it "working smarter not harder." Of course, using these modules makes life easier for those wanting to build thier own. Even providing schematics, board layouts, etc.. it can be difficult to get the same exact results with a switching regulator without some adjustments. With the module, it is basically a plug-n-play power supply.

    Now that I found this series of modules for less than $20 each, I will probably never build my own supplies for personal projects again (unless of course I need something really exotic.)

    The part number is PT6302. TI has a whole series of these for all kinds of needs. Most are under $20 up to about 5A.

  6. #196
    Para Laura thanatos106's Avatar
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    Damn!! I just read all 195 posts and I have to say this is anice project... keep up the good work

    Thanatos.
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  7. #197
    Constant Bitrate
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    Unfortunately, a mixture of laziness, weather, work, and family issues has prevented me from getting much further.

    I have not given up, just haven't made much new progress to post about in a while. I'll be getting back to it soon.

    Thanks

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