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)
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Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
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
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Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
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
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Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
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
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Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
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
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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
>
>
>
>
>
>
>
>
>
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Subject: | B&C Alternator and Voltage Regulator |
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Message 7
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Subject: | Re: Constructing an automatic RCA video camera |
feed splitter
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
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Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
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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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
>
>
>
>
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Subject: | Re: B&C Alternator and Voltage Regulator |
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
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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
>
>
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Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
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
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Subject: | Re: Constructing an automatic RCA video camera feed |
splitter
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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