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Two pulses with long gap: simplest circuit?

Started by Unknown February 21, 2019
Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I’m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don’t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward.

But to get a VIDEO clip, far preferable, I need a second pulse, to stop it.

I’m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it’s terminating edge would trigger the final mono, another 500 ms, stopping the video.

Does that seem reasonable please? Any other suggestions?

Terry, East Grinstead, UK
torsdag den 21. februar 2019 kl. 22.41.05 UTC+1 skrev terry...@gmail.com:
> Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I’m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don’t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. > > But to get a VIDEO clip, far preferable, I need a second pulse, to stop it. > > I’m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it’s terminating edge would trigger the final mono, another 500 ms, stopping the video. > > Does that seem reasonable please? Any other suggestions? > > Terry, East Grinstead, UK
https://www.iphonefaq.org/archives/975125 ?
On 21/02/2019 22:59, Lasse Langwadt Christensen wrote:
> torsdag den 21. februar 2019 kl. 22.41.05 UTC+1 skrev terry...@gmail.com: >> Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I’m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don’t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. >> >> But to get a VIDEO clip, far preferable, I need a second pulse, to stop it. >> >> I’m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it’s terminating edge would trigger the final mono, another 500 ms, stopping the video. >> >> Does that seem reasonable please? Any other suggestions? >> >> Terry, East Grinstead, UK > > https://www.iphonefaq.org/archives/975125 ? >
Or use a Rasperry Pi with a camera and Motion <https://motion-project.github.io/> But if you want to make pulses like this, do it in software. Use any kind of microcontroller board (or a Pi). Unless, of course, you find messing about with this kind of old analogue electronics fun - in which case, go for it.
Lasse Langwadt Christensen <langwadt@fonz.dk> wrote:

>torsdag den 21. februar 2019 kl. 22.41.05 UTC+1 skrev terry...@gmail.com: >> Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I&#2013266066;m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don&#2013266066;t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. >> >> But to get a VIDEO clip, far preferable, I need a second pulse, to stop it. >> >> I&#2013266066;m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it&#2013266066;s terminating edge would trigger the final mono, another 500 ms, stopping the video. >> >> Does that seem reasonable please? Any other suggestions? >> >> Terry, East Grinstead, UK > >https://www.iphonefaq.org/archives/975125 ?
Thanks, I'll try it. Although I suspect motion-sensing a fox/cat/badger/etc at night through a window onto a largish, dark garden might be a challenge. Terry, East Grinstead, UK
David Brown <david.brown@hesbynett.no> wrote:

>On 21/02/2019 22:59, Lasse Langwadt Christensen wrote: >> torsdag den 21. februar 2019 kl. 22.41.05 UTC+1 skrev terry...@gmail.com: >>> Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I&#2013266066;m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don&#2013266066;t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. >>> >>> But to get a VIDEO clip, far preferable, I need a second pulse, to stop it. >>> >>> I&#2013266066;m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it&#2013266066;s terminating edge would trigger the final mono, another 500 ms, stopping the video. >>> >>> Does that seem reasonable please? Any other suggestions? >>> >>> Terry, East Grinstead, UK >> >> https://www.iphonefaq.org/archives/975125 ? >> > >Or use a Rasperry Pi with a camera and Motion ><https://motion-project.github.io/> > >But if you want to make pulses like this, do it in software. Use any >kind of microcontroller board (or a Pi).
Not into programming, so PICS, microcontrollers, FGPS, Pi, etc not options.
>Unless, of course, you find messing about with this kind of old analogue >electronics fun - in which case, go for it.
That's it! And I have a few thousand legacy components in my shed workshop gathering dust... Terry, East Grinstead, UK
torsdag den 21. februar 2019 kl. 23.19.05 UTC+1 skrev Terry Pinnell:
> David Brown <david.brown@hesbynett.no> wrote: > > >On 21/02/2019 22:59, Lasse Langwadt Christensen wrote: > >> torsdag den 21. februar 2019 kl. 22.41.05 UTC+1 skrev terry...@gmail.com: > >>> Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I&rsquo;m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don&rsquo;t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. > >>> > >>> But to get a VIDEO clip, far preferable, I need a second pulse, to stop it. > >>> > >>> I&rsquo;m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it&rsquo;s terminating edge would trigger the final mono, another 500 ms, stopping the video. > >>> > >>> Does that seem reasonable please? Any other suggestions? > >>> > >>> Terry, East Grinstead, UK > >> > >> https://www.iphonefaq.org/archives/975125 ? > >> > > > >Or use a Rasperry Pi with a camera and Motion > ><https://motion-project.github.io/> > > > >But if you want to make pulses like this, do it in software. Use any > >kind of microcontroller board (or a Pi). > > Not into programming, so PICS, microcontrollers, FGPS, Pi, etc not > options. > > > >Unless, of course, you find messing about with this kind of old analogue > >electronics fun - in which case, go for it. > > That's it! And I have a few thousand legacy components in my shed > workshop gathering dust... > > Terry, East Grinstead, UK
https://www.ebay.co.uk/itm/382165102637 3&pound; wit free shipping
On 21/02/2019 22:16, Terry Pinnell wrote:
> Lasse Langwadt Christensen <langwadt@fonz.dk> wrote: > >> torsdag den 21. februar 2019 kl. 22.41.05 UTC+1 skrev terry...@gmail.com: >>> Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I&rsquo;m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don&rsquo;t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. >>> >>> But to get a VIDEO clip, far preferable, I need a second pulse, to stop it. >>> >>> I&rsquo;m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it&rsquo;s terminating edge would trigger the final mono, another 500 ms, stopping the video. >>> >>> Does that seem reasonable please? Any other suggestions? >>> >>> Terry, East Grinstead, UK >> >> https://www.iphonefaq.org/archives/975125 ? > > Thanks, I'll try it. Although I suspect motion-sensing a > fox/cat/badger/etc at night through a window onto a largish, dark garden > might be a challenge.
PIR triggered video camera traps with IR illuminators are relatively cheap these days. If you insist on rolling your own then CMOS 555 and a suitable divide by 2^N will allow longish programmable delays. -- Regards, Martin Brown
In article <fi8u6e1445pb1oqc7liar9bh8na2sm4ce2@4ax.com>, 
me@somewhere.invalid says...
> > Thanks, I'll try it. Although I suspect motion-sensing a > fox/cat/badger/etc at night through a window onto a largish, dark garden > might be a challenge.
So is your trigger going to turn the lights on too? I have IR video from my trailcam of a fox reacting when I turned on a torch (not knowing it was there). So the fox will notice. Whereas if the lights are on all the time pesumably it won't. In which case motion sensing in a camera image makes more sense... Mike (who also has a lot of legacy components but finds programming easier).
On 02/21/2019 04:41 PM, terrypingm@gmail.com wrote:
> Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I&rsquo;m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don&rsquo;t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. > > But to get a VIDEO clip, far preferable, I need a second pulse, to stop it. > > I&rsquo;m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it&rsquo;s terminating edge would trigger the final mono, another 500 ms, stopping the video. > > Does that seem reasonable please? Any other suggestions? > > Terry, East Grinstead, UK >
You could plant about 10 M-80s and a few jugs of Tannerite in the area of the garden the fox likes to visit with detonators rigged to the trip-wire, and when that little crop-thieving bastard shows up KABOOM blow that sumbitch to smithereens. The flash from the detonation should be enough to trigger a photodetector and snap as many iPhone photos as you like
On 2/21/2019 1:41 PM, terrypingm@gmail.com wrote:
> Project: To get images with my iPhone 6S+ of a fox visiting our garden overnight. One approach I&rsquo;m considering is to tap the button of a Bluetooth camera shutter gadget (from CAMKIX) with a 500 ms pulse to a solenoid, triggered in various ways. (I don&rsquo;t want to crack open the tiny case to attempt that with a circuit mod.) That seems reasonably straightforward. > > But to get a VIDEO clip, far preferable, I need a second pulse, to stop it. > > I&rsquo;m thinking I would need three non-retriggerable monos. The first would be triggered by a +ve going signal from one of my sensors. (Such as a thin nylon trip wire or a micro switch under a large lightweight panel, cunningly disguised.) It would last 500 ms, activating the 12V solenoid. The second mono would be be started by the terminating edge of the first. Its duration would be say 20 s and it&rsquo;s terminating edge would trigger the final mono, another 500 ms, stopping the video. > > Does that seem reasonable please? Any other suggestions? > > Terry, East Grinstead, UK >
I'm not an expert on iAnything, so this may be off base... There are at least a zillion apps for Android that will monitor an area, detect motion, capture video, email it anywhere you want. I can't imagine that there isn't at least one iPhone App that can do that. Virtually any IP camera can do that. What happens if you just let the video run until the iphone fills up? As long as it doesn't crash the phone, you can edit out what you need. Somebody suggested a microcontroller for a timer. These https://www.ebay.com/itm/Digispark-Kickstarter-Micro-General-USB-Development-Board-ATTINY85-Practical-Top/272911808821 are trivial to program and far easier to use than hanging a bunch of one-shots together. IIRC, there's a demo program that does a one-shot. The tone of your post suggests that your visitor is benevolent and you just want to capture cute videos to post to Instagram. Had you made any mention of other motivation, I might have volunteered how, a decade ago, we used a motion camera to figger out how a raccoon was getting the bait out of the trap without triggering it. Spoiler alert, it was more about understanding animal behavior than any hardware. Spoiler alert two, the time to ask yourself, "What do I do now?" is BEFORE you have an angry Raccoon in a cage. This is even more important if it's a skunk. If you wanted him gone, maybe you need a wall. I believe I know of someone with a few billion to spend on such a thing. You'd need to frame it as a deterrent to illegal immigration.