AeroElectric-List Digest Archive

Mon 10/16/17


Total Messages Posted: 13



Today's Message Index:
----------------------
 
     1. 01:24 AM - Re: Constructing an automatic RCA video camera feed splitter (Airdog77)
     2. 01:45 AM - Re: Constructing an automatic RCA video camera feed splitter (Airdog77)
     3. 03:06 PM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page)
     4. 04:12 PM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page)
     5. 05:38 PM - Re: Re: Constructing an automatic RCA video camera feed splitter (Alec Myers)
     6. 05:59 PM - B&C Alternator and Voltage Regulator  (Matthew Freeman)
     7. 06:10 PM - Re: Re: Constructing an automatic RCA video camera feed splitter (Charlie England)
     8. 06:15 PM - Re: Constructing an automatic RCA video camera feed splitter (Airdog77)
     9. 06:20 PM - Re: Re: Constructing an automatic RCA video camera feed splitter (Alec Myers)
    10. 08:02 PM - Re: B&C Alternator and Voltage Regulator (user9253)
    11. 08:51 PM - Re: Re: B&C Alternator and Voltage Regulator (don van santen)
    12. 09:42 PM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page)
    13. 09:46 PM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page)
 
 
 


Message 1


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    Time: 01:24:02 AM PST US
    Subject: Re: Constructing an automatic RCA video camera feed
    splitter
    From: "Airdog77" <Airdog77@gmail.com>
    Eric, You asked: Question: do you want to be able to adjust the scan rate as a matter of routine operation (i.e. with a panel-mounted knob), or do you envision setting the rate where you like it at installation, and leaving it alone? For me setting it off-panel is fine. If I can get to a POT and adjust the scan rate, that'd be great... but I don't envision having to tweak the rate more than 1-2 times before getting it dialed in. Still not getting but an occasional update email on this forum...guess I need to check in a lot more, eh?! :) Thanks! Wade -------- Airdog Wade Parton Building Long-EZ 916WP www.longezpush.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473602#473602


    Message 2


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    Time: 01:45:29 AM PST US
    Subject: Re: Constructing an automatic RCA video camera feed
    splitter
    From: "Airdog77" <Airdog77@gmail.com>
    Eric, > > - Do you have a preference WRT discrete ICs -vs- a PIC microcontroller? > 240/241, whatever it takes! (Michael Keaton "Mr. Mom" ref there... In other words: no preference [Shocked] ) > - Do you have any desires for additional features or functions that would push us in one direction or the other? No, I like the one toggle or one push-button control on the panel. Simple is good. Scalability to control more cameras, if able, would be a nice feature but not a requirement. > - Of the user interface options you've seen discussed, what would be your preference? I prefer the ON-ON-(ON) toggle you mentioned, but a single push button would be fine as well. > - For camera scan rate, would you prefer to set it once and forget it, or have an accessible control for routine use? Being able to set scan rate internal to/or on the box is good, however, don't need a panel mounted control. > - Would you prefer to install a device with five RCA jacks for signal and a 2-position header for power, or one D-Sub connector for everything? 5 RCA jacks would be better, much simpler hook up for my configuration. Thanks again Eric! Cheers, Wade -------- Airdog Wade Parton Building Long-EZ 916WP www.longezpush.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473603#473603


    Message 3


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    Time: 03:06:10 PM PST US
    Subject: Re: Constructing an automatic RCA video camera feed
    splitter
    From: "Eric Page" <edpav8r@yahoo.com>
    alec(at)alecmyers.com wrote: > I think the video sync problem could be a big deal. I would absolutely order a couple of cameras and the screen I intended to use and try switching between the sources with a mechanical toggle switch to get some confidence the result is going to be acceptable. Hmmm... I don't have the cameras or a monitor to test it with, and I don't have any need for them. I'm not sure what to do here other than cross my fingers but since the cost of failure is pretty low, I'm OK with that! > A CD4066 advertises itself as a quad gate analog switch, and its only $0.60. Alternatively since nobody here (I presume) is an experienced analog video design engineer, maybe the $8 part is worth it for ease of implementation. Wow, good find. It sure looks to me like it would work, but I think we'd be short of PIC outputs to drive it. Vcc, Gnd, rate pot, scan/hold, step, and 4 outputs to the CD4066 comes to 9 pins. We could put a 2-to-4 line decoder (CD4555) between them, but that's another 16-DIP package. Can the scan/hold and step functions be handled on one pin? I'm thinking LOW = hold (switch at center "ON" position, tied to Gnd), HIGH for >300mS = scan (switch at upper "ON" position, tied to 5V), HIGH for Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473625#473625


    Message 4


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    Time: 04:12:10 PM PST US
    Subject: Re: Constructing an automatic RCA video camera feed
    splitter
    From: "Eric Page" <edpav8r@yahoo.com>
    Wade, Airdog77 wrote: > > No, I like the one toggle or one push-button control on the panel. Simple is good. Scalability to control more cameras, if able, would be a nice feature but not a requirement. Got it: keep it simple. How do you like Alec's idea to have the switch work left-right and be momentary in both directions? Short press steps forward (right) or back (left), long press (2 sec?) starts scanning forward or back. Same functionality, but with the ability to move in either direction. > Being able to set scan rate internal to/or on the box is good, however, don't need a panel mounted control. OK, we'll stick with a set-it-at-installation design. > 5 RCA jacks would be better, much simpler hook up for my configuration. OK, how about a compromise: we design it around a D-Sub and provide a mating connector with RCA pigtails you can use with the equipment you already have on hand? This gives us a ready-made enclosure in the form of the D-Sub shell, and provides a universally available connector for installations in the future. Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473626#473626


    Message 5


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    Time: 05:38:44 PM PST US
    From: Alec Myers <alec@alecmyers.com>
    Subject: Re: Constructing an automatic RCA video camera
    feed splitter Actually we can combine both a set-at-install with a programmable cycle period. Fans of jumpers/resistors and buttonologists can both be happy. And a two-way toggle is the same as two push buttons, and if you only want one push button simply dont install the second, and be happy with only scanning forward. Dont worry about the number of pins on a micro controller - buy the micro controller with enough pins to do what you want. In the face of an $8 part, extra pins are free. >>Hmmm... I don't have the cameras or a monitor to test it with, and I don't have any need for them. I'm not sure what to do here other than cross my fingers but since the cost of failure is pretty low, I'm OK with that! Someone whos going to build and install this system - and who is going to buy some cameras and a screen either now or later - should buy them, now, and check the idea of frequency and asynchronously switching a bunch of free-running composite video source into the choice of video monitor yields acceptable results. Before a lot of time is spent on this. The cost of failure is - a lot of wasted engineering time and resource writing code and designing circuit boards that will function perfectly and achieve nothing. > On Oct 16, 2017, at 7:11 PM, Eric Page <edpav8r@yahoo.com> wrote: > > > Wade, > > > Airdog77 wrote: >> >> No, I like the one toggle or one push-button control on the panel. Simple is good. Scalability to control more cameras, if able, would be a nice feature but not a requirement. > > > Got it: keep it simple. How do you like Alec's idea to have the switch work left-right and be momentary in both directions? Short press steps forward (right) or back (left), long press (2 sec?) starts scanning forward or back. Same functionality, but with the ability to move in either direction. > > >> Being able to set scan rate internal to/or on the box is good, however, don't need a panel mounted control. > > OK, we'll stick with a set-it-at-installation design. > > >> 5 RCA jacks would be better, much simpler hook up for my configuration. > > OK, how about a compromise: we design it around a D-Sub and provide a mating connector with RCA pigtails you can use with the equipment you already have on hand? This gives us a ready-made enclosure in the form of the D-Sub shell, and provides a universally available connector for installations in the future. > > Eric > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=473626#473626 > > > > > > > > >


    Message 6


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    Time: 05:59:18 PM PST US
    From: Matthew Freeman <alaskamatt@hotmail.com>
    Subject: B&C Alternator and Voltage Regulator
    SGkgQm9iLA0KDQpJIGhhdmUgYSBuZXcgQiZDIDYwIGFtcCBhbHRlcm5hdG9yIGFuZCB0aGUgY29y cmVzcG9uZGluZyBMUjNDIHZvbHRhZ2UgcmVndWxhdG9yIGluc3RhbGxlZCBpbiBhbiBleHBlcmlt ZW50YWwgR2xhc3Rhci4NCg0KQWxsIGNvbXBvbmVudHMgYXJlIG5ldyBzaW5jZSBJIHRob3VnaHQg dGhleSB3ZXJlIGNhdXNpbmcgdGhlIG92ZXIgdm9sdGFnZSBwcm9ibGVtLiBUaGUgc2hpcCBoYXMg YWJvdXQgMTYwMCBob3VycyBUVC4NCg0KRGlyZWN0IHRvIHRoZSBwcm9ibGVtOg0KDQpBZnRlciBJ IHN0YXJ0IHRoZSBlbmdpbmUsIHRoZSB2b2x0YWdlIHN0ZWFkaWx5IGluY3JlYXNlcyB1bnRpbCB0 aGUgNS1hbXAgZmllbGQgY2lyY3VpdCB0cmlwcywgc29tZXBsYWNlIG92ZXIgMTUgdm9sdHMuDQoN CknigJl2ZSBnb25lIHRocm91Z2ggdGhlIFRlY2huaWNhbCBNYW51YWwgZm9yIE1vZGVsIE5vLiBM UjNDLTE0IGFuZCBMUjNDLTI4IExpbmVhciBSZWd1bGF0b3IgdHJvdWJsZXNob290aW5nIGd1aWRl IGFuZCB0aGUgdm9sdGFnZSBhbmQgcmVzaXN0YW5jZSBjaGVja3MgbWVldCBzdGFuZGFyZHMuDQoN CknigJl2ZSBhbHNvIHNwZW50IGNvdW50bGVzcyBob3VycyB3aXRoIFRKIGF0IEIgYW5kIEMgdGVj aG5pY2FsIHN1cHBvcnQgdHJ5aW5nIHRvIHVucmF2ZWwgdGhpcyBteXN0ZXJ5Lg0KDQpOZXcgcGFy dHMgaW5jbHVkZToNCkJDNDYwLUggYWx0ZXJuYXRvcg0KTFIzQy0xNCB2b2x0YWdlIHJlZ3VsYXRv cg0KQmF0dGVyeSBtYXN0ZXIgc29sZW5vaWQNCjUtYW1wIGJyZWFrZXINCjItYW1wIGJyZWFrZXIN ClRvZ2dsZSBzd2l0Y2ggdG8gYWN0aXZhdGUgdGhlIDUgYW5kIDIgYW1wIGJyZWFrZXJzDQpXaXJl IGFuZCBjcmltcHMNCjMvOOKAnSBncm91bmQgYnJhaWQgY2FibGUNCg0KSeKAmXZlIGlzb2xhdGVk IHRoZSBzaGlwIGVsZWN0cmljYWwgc3lzdGVtIHRvOg0KICBTZWFsZWQgbGVhZCBhY2lkIGJhdHRl cnkNCiAgTFIzQyB2b2x0YWdlIHJlZ3VsYXRvcg0KICBCQzQ2MC1IIDYwIGFtcCBhbHRlcm5hdG9y DQogIEJhdHRlcnkgc29sZW5vaWQNCg0KUG93ZXIgdG8gZW5lcmdpemUgdGhlIDUtYW1wIGFuZCAy LWFtcCB2b2x0YWdlIHJlZ3VsYXRvciwgcGx1cyB0aGUgbWFnbmV0byBzd2l0Y2ggdG8gYWN0aXZh dGUgdGhlIHN0YXJ0ZXIgc29sZW5vaWQgaXMgZGlyZWN0bHkgb2ZmIHRoZSBiYXR0ZXJ5Lg0KDQpU byBzdGFydCB0aGUgZW5naW5lLCBJIHVzZSBhIGNsaXAgbGVhZCB0byBncm91bmQgdGhlIG1hc3Rl ciBzb2xlbm9pZCBzd2l0Y2guDQoNCk5vdGhpbmcgZWxzZSBpcyBjb25uZWN0ZWQgdG8gdGhlIGVs ZWN0cmljYWwgc3lzdGVtLg0KDQpJ4oCZdmUgcnVuIGEgMy844oCdIGdyb3VuZCBicmFpZCBjYWJs ZSBmcm9tIHRoZSBhbHRlcm5hdG9yIGNhc2UgdG8gYSBicmFzcyBncm91bmQgYnVzIGJhci4gQSBz ZWNvbmQgMy844oCdIGdyb3VuZCBicmFpZCBjYWJsZSBydW5zIGZyb20gdGhlIGJhdHRlcnkgdG8g dGhlIHN0ZWVsIGZyYW1lLCB0aGVuIHRvIHRoZSBicmFzcyBidXMgYmFyIHdpdGggbm8gc3BsaWNl IGluIHRoZSBtaWRkbGUuDQoNClRoZSB2b2x0YWdlIHJlZ3VsYXRvciBpcyBncm91bmRlZCB3aXRo IGFuIDE4LWdhIHdpcmUgZnJvbSB0aGUgZ3JvdW5kIHN0dWQgYW5kIFRlcm1pbmFsICM3IHRvIHRo ZSBicmFzcyBidXMgYmFyLg0KDQpQcmlvciB0byBpc29sYXRpbmcgdGhlIHNoaXDigJlzIGVsZWN0 cmljYWwgYnVzLCBJIG9ic2VydmVkIHRoZSBhbXBzIGNsZWFybHkgY2hhcmdpbmcgdGhlIGJhdHRl cnksIGluaXRpYWxseSBhIGhpZ2ggYW1wIGRyYXcsIGFuZCBldmVudHVhbGx5IHRoZSBhbXBzIGRl Y3JlYXNlZCB0byBhIHNpbmdsZSBkaWdpdCBudW1iZXIsIGJ1dCB0aGUgdm9sdGFnZSB3b3VsZCBj b250aW51ZSB0byBjbGltYiB3ZWxsIGFib3ZlIHRoZSAxNC40IHZvbHQgZmFjdG9yeSBzZXQgcG9p bnQuDQoNCkxhc3RseTsNCg0KV2l0aCB0aGUgZW5naW5lIHJ1bm5pbmcgKHN0ZWFkaWx5IGluY3Jl YXNpbmcgdm9sdGFnZSkgUGluIDYgc2hvd2VkIDE1Ljcgdm9sdHMgd2hpbGUgUGluIDQgc2hvd2Vk IDEuNzUgdm9sdHMuICBDb3VsZCB0aGlzIHdlaXJkIHJlYWRpbmcgcG9pbnQgdG8gdGhlIHByb2Js ZW0/DQoNClBpbiA0IG9mIDEuNzUgdm9sdHMgZG9lcyBub3QgbWFrZSBzZW5zZS4NCg0KSeKAmW0g c3R1bXBlZCEgIENhbiB5b3Ugb2ZmZXIgbWUgYW55IGluc2lnaHQ/DQoNCk1hdHQgRnJlZW1hbg0K Q2h1Z2lhaywgQUsNCjkwNy04NjMtMjIwNCBDZWxsDQpBbGFza2FNYXR0QEhvdG1haWwuY29tPG1h aWx0bzpBbGFza2FNYXR0QEhvdG1haWwuY29tPg0K


    Message 7


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    Time: 06:10:05 PM PST US
    Subject: Re: Constructing an automatic RCA video camera
    feed splitter
    From: Charlie England <ceengland7@gmail.com>
    It's been a really long time since I did any TV work (long before digital TV standards). But from what I remember about composite video, I'd be very surprised if sync is a problem. Both horizontal and vertical sync are embedded in the video. Here's the 1st tutorial I clicked on in 'the google': http://www.ni.com/white-paper/4750/en/ Charlie On 10/16/2017 7:36 PM, Alec Myers wrote: > > Actually we can combine both a set-at-install with a programmable cycle period. Fans of jumpers/resistors and buttonologists can both be happy. > And a two-way toggle is the same as two push buttons, and if you only want one push button simply dont install the second, and be happy with only scanning forward. > > Dont worry about the number of pins on a micro controller - buy the micro controller with enough pins to do what you want. In the face of an $8 part, extra pins are free. > >>> Hmmm... I don't have the cameras or a monitor to test it with, and I don't have any need for them. I'm not sure what to do here other than cross my fingers but since the cost of failure is pretty low, I'm OK with that! > Someone whos going to build and install this system - and who is going to buy some cameras and a screen either now or later - should buy them, now, and check the idea of frequency and asynchronously switching a bunch of free-running composite video source into the choice of video monitor yields acceptable results. Before a lot of time is spent on this. The cost of failure is - a lot of wasted engineering time and resource writing code and designing circuit boards that will function perfectly and achieve nothing. > > >> On Oct 16, 2017, at 7:11 PM, Eric Page <edpav8r@yahoo.com> wrote: >> >> >> Wade, >> >> >> Airdog77 wrote: >>> No, I like the one toggle or one push-button control on the panel. Simple is good. Scalability to control more cameras, if able, would be a nice feature but not a requirement. >> >> Got it: keep it simple. How do you like Alec's idea to have the switch work left-right and be momentary in both directions? Short press steps forward (right) or back (left), long press (2 sec?) starts scanning forward or back. Same functionality, but with the ability to move in either direction. >> >> >>> Being able to set scan rate internal to/or on the box is good, however, don't need a panel mounted control. >> OK, we'll stick with a set-it-at-installation design. >> >>> 5 RCA jacks would be better, much simpler hook up for my configuration. >> OK, how about a compromise: we design it around a D-Sub and provide a mating connector with RCA pigtails you can use with the equipment you already have on hand? This gives us a ready-made enclosure in the form of the D-Sub shell, and provides a universally available connector for installations in the future. >> >> Eric >> --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus


    Message 8


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    Time: 06:15:54 PM PST US
    Subject: Re: Constructing an automatic RCA video camera feed
    splitter
    From: "Airdog77" <Airdog77@gmail.com>
    Eric, > How do you like Alec's idea to have the switch work left-right and be momentary in both directions? Short press steps forward (right) or back (left), long press (2 sec?) starts scanning forward or back. Same functionality, but with the ability to move in either direction. > That sounds great. > we design it around a D-Sub and provide a mating connector with RCA pigtails you can use with the equipment you already have on hand? That sounds great too! Anything that's a small form factor that allows me to connect RCA works for me. Cheers, Wade -------- Airdog Wade Parton Building Long-EZ 916WP www.longezpush.com Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473631#473631


    Message 9


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    Time: 06:20:38 PM PST US
    From: Alec Myers <alec@alecmyers.com>
    Subject: Re: Constructing an automatic RCA video camera
    feed splitter It really depends on how the video display is designed. Analog video was designed to be synchronized with the mains supply frequency - 60Hz in North America, 50Hz in Europe. When I was involved on a consulting project at the BBC in the late 90s (by coincidence, it was a microcontroller project, and got me hooked on PIC programming) I was shown the rack rooms full of cables doing nothing but acting as delay Iines to make sure each studio was exactly the same propagation delay from the transmission switching room, to maintain sync. That was before it was easier to do it digitally, of course. There are also sorts of scenarios about how a cheap Chinesium video receiver is going to handle a short frame, or a long frame, and some of them may be very unpretty. Since someone is going to have buy some cameras and a screen, to install in their airplane, Id feel happier knowing that theyve tried it out, before spending a happy Sunday writing the code. > On Oct 16, 2017, at 9:12 PM, Charlie England <ceengland7@gmail.com> wrote: > > > It's been a really long time since I did any TV work (long before digital TV standards). But from what I remember about composite video, I'd be very surprised if sync is a problem. Both horizontal and vertical sync are embedded in the video. Here's the 1st tutorial I clicked on in 'the google': > > http://www.ni.com/white-paper/4750/en/ > > Charlie > > On 10/16/2017 7:36 PM, Alec Myers wrote: >> >> Actually we can combine both a set-at-install with a programmable cycle period. Fans of jumpers/resistors and buttonologists can both be happy. >> And a two-way toggle is the same as two push buttons, and if you only want one push button simply dont install the second, and be happy with only scanning forward. >> >> Dont worry about the number of pins on a micro controller - buy the micro controller with enough pins to do what you want. In the face of an $8 part, extra pins are free. >> >>>> Hmmm... I don't have the cameras or a monitor to test it with, and I don't have any need for them. I'm not sure what to do here other than cross my fingers but since the cost of failure is pretty low, I'm OK with that! >> Someone whos going to build and install this system - and who is going to buy some cameras and a screen either now or later - should buy them, now, and check the idea of frequency and asynchronously switching a bunch of free-running composite video source into the choice of video monitor yields acceptable results. Before a lot of time is spent on this. The cost of failure is - a lot of wasted engineering time and resource writing code and designing circuit boards that will function perfectly and achieve nothing. >> >> >>> On Oct 16, 2017, at 7:11 PM, Eric Page <edpav8r@yahoo.com> wrote: >>> >>> >>> Wade, >>> >>> >>> Airdog77 wrote: >>>> No, I like the one toggle or one push-button control on the panel. Simple is good. Scalability to control more cameras, if able, would be a nice feature but not a requirement. >>> >>> Got it: keep it simple. How do you like Alec's idea to have the switch work left-right and be momentary in both directions? Short press steps forward (right) or back (left), long press (2 sec?) starts scanning forward or back. Same functionality, but with the ability to move in either direction. >>> >>> >>>> Being able to set scan rate internal to/or on the box is good, however, don't need a panel mounted control. >>> OK, we'll stick with a set-it-at-installation design. >>> >>>> 5 RCA jacks would be better, much simpler hook up for my configuration. >>> OK, how about a compromise: we design it around a D-Sub and provide a mating connector with RCA pigtails you can use with the equipment you already have on hand? This gives us a ready-made enclosure in the form of the D-Sub shell, and provides a universally available connector for installations in the future. >>> >>> Eric >>> > > > --- > This email has been checked for viruses by Avast antivirus software. > https://www.avast.com/antivirus > > > >


    Message 10


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    Time: 08:02:20 PM PST US
    Subject: Re: B&C Alternator and Voltage Regulator
    From: "user9253" <fransew@gmail.com>
    What are you using for a reference point when measuring voltages? I suggest that you use pin 7 of the LR-3 voltage regulator. What is the voltage on pin 3 when there is high voltage? Fill in the blanks on the B&C LR-3 troubleshooting guide and post them here. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473633#473633


    Message 11


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    Time: 08:51:23 PM PST US
    From: don van santen <donvansanten@gmail.com>
    Subject: Re: B&C Alternator and Voltage Regulator
    And put a new battery in your hand held volt meter. A worn out battery has been known to give very inconsistant and variable readings. On Oct 16, 2017 20:07, "user9253" <fransew@gmail.com> wrote: > > What are you using for a reference point when measuring voltages? I > suggest that you use pin 7 of the LR-3 voltage regulator. > What is the voltage on pin 3 when there is high voltage? > Fill in the blanks on the B&C LR-3 troubleshooting guide and post them > here. > > -------- > Joe Gores > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=473633#473633 > >


    Message 12


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    Time: 09:42:57 PM PST US
    Subject: Re: Constructing an automatic RCA video camera feed
    splitter
    From: "Eric Page" <edpav8r@yahoo.com>
    alec(at)alecmyers.com wrote: > Actually we can combine both a set-at-install with a programmable cycle period. Fans of jumpers/resistors and buttonologists can both be happy. > And a two-way toggle is the same as two push buttons, and if you only want one push button simply dont install the second, and be happy with only scanning forward. Well, I'm trying to keep the interface as simple as possible. I don't want a situation where the user installs one switch/button and has to learn and remember multiple button-presses, or X number of presses in Y seconds to access a programming mode. I would prefer to just have a pot that the installer can twiddle to set the desired scan rate once and leave it at that. > Dont worry about the number of pins on a micro controller - buy the micro controller with enough pins to do what you want. In the face of an $8 part, extra pins are free. I wouldn't, except that to fit this device into a D-25 or D-37 backshell, I need to keep pin count low. In any case, I think an 8-pin device will be fine. See my next post. > Someone whos going to build and install this system - and who is going to buy some cameras and a screen either now or later - should buy them, now, and check the idea of frequency and asynchronously switching a bunch of free-running composite video source into the choice of video monitor yields acceptable results. Before a lot of time is spent on this. The cost of failure is - a lot of wasted engineering time and resource writing code and designing circuit boards that will function perfectly and achieve nothing. Indeed -- good point. Wade, if you're reading this, could you rig up this test with your EFIS and cameras and let us know how it works? We need to know if switching from one camera to another causes any artifacts in the displayed video (missing or frozen frames, pixelation, rolling video, etc.). If you need a switch to run this test, here's one on eBay from a US seller, for $3, delivered in about a week: http://preview.tinyurl.com/yabgbf88 Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473635#473635


    Message 13


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    Time: 09:46:21 PM PST US
    Subject: Re: Constructing an automatic RCA video camera feed
    splitter
    From: "Eric Page" <edpav8r@yahoo.com>
    I'm convinced that using a PIC is the way to go. I'd also like to give the CD4066 a try as the switch. Once we hear from Wade that his EFIS and video adapter handle the camera feed switching OK, I'll edit the schematic and work on a board layout. Then Alec/Paul can write some code. Here's what I'd like to accomplish with the software: 1. At power-up, wait a bit for the regulator to settle, then read voltage on AN3/Pin3 and correlate to scan rate (0-5V = 2-10 sec per camera). 2. Start scanning at camera 1, then 2, 3, 4, 1, etc. 3. Monitor the switch(es) and respond as follows: - Short press R or L: During scan mode, stop scan. During hold mode, advance one camera forward (R) or back (L). - Long press R or L: During scan mode, reverse scan direction if switch is moved opposite to current scan direction. During hold mode, begin scan forward (R) or back (L). Installation with an (ON)-ON-(ON) toggle switch would work as above. Installation with a single pushbutton would have the switch connected as the RIGHT position of the toggle, and would function as follows: - Short press: In scan mode, stop scan. In hold mode, increment by one camera. - Long press: In scan mode, no change. In hold mode, begin scan from current camera. I've done a quick demo layout with the PIC and CD4066, so I could figure out the best GPIO assignments. See "Demo_Layout.jpg" below. "Mode_Sw_AN2.jpg" below shows my best guess at how to attach the (ON)-ON-(ON) toggle switch to AN2/Pin5. Please let me know if there's a better way to do it. Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473636#473636 Attachments: http://forums.matronics.com//files/demo_layout_145.jpg http://forums.matronics.com//files/mode_sw_an2_270.jpg




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