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Topic:
Grand idea for IR sensors: keep people from peeing on your property
This thread has 10 replies. Displaying all posts.
Post 1 made on Saturday October 20, 2018 at 11:18
Ernie Gilman
Yes, That Ernie!
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This isn't just your garden variety (yuk yuk) lawn sprinkler. There's also at least one pot of water that tips and drenches people.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 2 made on Saturday October 20, 2018 at 12:16
Mac Burks (39)
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Fantastic use of sensors/automation. Makes me want to move near a college bar.
Avid Stamp Collector - I really love 39 Cent Stamps
Post 3 made on Saturday October 20, 2018 at 12:54
buzz
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I have a friend who lived across the street from an inner city "relief station" she would run out and directly confront the guy while in the act.

---

An engineer friend of the family had a frame house that was on a dog trail. As each male canine passed that corner, it was marked. Needless to say, this was a very stinky corner that was destined for rapid deterioration. He placed some metal widow screen on the corner and on the ground around -- with a difference of potential. The goal was to sting a certain sphincter muscle. After a few days of experience, passersby would bark at the corner, but none would mark.

While laying this sort of obvious trap for human visitors could expose one to legal issues, I'm not sure if a perpetrator would want to explain to a court exactly how he was exposed to this "injury". That said, we've all had countless issues with cable feed ground loops -- it might be possible to constructively arrange the location of an ungrounded cable feed ...

---

By the way, in my area this is not an exclusively male activity.
OP | Post 4 made on Saturday October 20, 2018 at 18:34
Ernie Gilman
Yes, That Ernie!
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When I was in college the guy who ran the Physics Department stockroom told of a dog that would prance down his street every day and stop to pee on the prize roses. Said stockroom manager put a stop to this with a single wire wrapped around a rose bush and connected to the power line midstream.

After that, the dog pranced down the street, crossed away from the evil rose bush, crossed back, and kept going.

That's the story as I heard it.
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 5 made on Sunday October 21, 2018 at 09:02
Fins
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When I worked for a friend that had an invisible fence dealership, some customers dogs would run when they saw my friend show up. And for others he could waive one of the flags we used to mark the boundary and they would run to hide.
Civil War reenactment is LARPing for people with no imagination.

Post 6 made on Sunday October 21, 2018 at 09:53
buzz
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For some dogs crossing that invisible fence is a "cost" of roaming. They will stand at the boundary, hesitate for a moment, than charge through.

When I was a boy we didn't have an invisible fence, but the dog knew exactly where the property line was. The dog would stand at the line, contemplate the costs (punishment on return) and benefits, then bolt. There was a butcher shop a few blocks away. She would go to their back door and beg. A hand would extend out the door and drop scraps for her. Eventually, she would return (fat and happy), but go to the garage door knowing that her punishment was being banned to the garage for a while.

By the way in my post above, I meant to say "... in my area this is not an exclusively human male activity".
Post 7 made on Sunday October 21, 2018 at 10:03
Fins
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For the most part, if a dog is willing to go through the fence, then the tech didn’t use the correct collar or program it right or the dog hasn’t been trained right. The stubborn collars will keep shocking for 30 seconds. Not many dogs want to suffer that. LOL
Civil War reenactment is LARPing for people with no imagination.

Post 8 made on Sunday October 21, 2018 at 10:34
highfigh
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Animals learn from punishment, some faster than others. A friend had a college roommate who would rummage through peoples' things, sometimes when they were there (like my friend) as soon as he would walk into their room. Steve, who was studying electronics, came up with an amusing way to stop this by charging a large, square electrolytic capacitor to about 400VDC and leaving it under the newspaper that he, not the roommate had subscribed to. Bob would see the hump in the paper an explore, finding the cap. He picked it up and examined it, with the legs pointing up, then flipped it over so he could see the other side. When it landed in the palm of his hand, it discharged.

Good times! Bob was mad, Steve was amused and Bob wants to get together for a drink. Don't be like Bob- he must have forgotten.
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
OP | Post 9 made on Sunday October 21, 2018 at 10:40
Ernie Gilman
Yes, That Ernie!
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Our high school physics professor had a strict rule, which was that no students were to even TOUCH any of the things on the prof's demo table at the front of the room. Sure enough, one of the things on that table was an oil-filled capacitor of about 10 microfarads, charged to six hundred volts. Every semester at least one student heard "I TOLD you never to touch anything up here on this table!"
A good answer is easier with a clear question giving the make and model of everything.
"The biggest problem in communication is the illusion that it has taken place." -- G. “Bernie” Shaw
Post 10 made on Sunday October 21, 2018 at 10:48
highfigh
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On October 21, 2018 at 10:40, Ernie Gilman said...
Our high school physics professor had a strict rule, which was that no students were to even TOUCH any of the things on the prof's demo table at the front of the room. Sure enough, one of the things on that table was an oil-filled capacitor of about 10 microfarads, charged to six hundred volts. Every semester at least one student heard "I TOLD you never to touch anything up here on this table!"

Last edited by highfigh on October 21, 2018 11:08.
My mechanic told me, "I couldn't repair your brakes, so I made your horn louder."
Post 11 made on Monday October 22, 2018 at 08:19
buzz
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In a lab we were working in a closed, windowless room. One afternoon, we were doing some silver solder work on vacuum system plumbing. Pranksters decided to heckle us and periodically a hand would reach around the corner and flick off the lights. Naturally we were annoyed because we had to put down the torch to restore the lights. Of course this would wreck our preheat. This was getting annoying. I was not working as an electronic tech at that time, but I still had ties to the electronics lab. From the electronics lab I borrowed an oil filled capacitor and charged it.

Back in our room I connected the capacitor to a little "halo" of wire that guarded the light switch toggle. One had to encounter the halo in order to flip the switch. Since the pranksters were blindly reaching around a corner, they couldn't see the obvious trap. It was interesting because this was really a gang of pranksters and once "bitten" by my little guard, other pranksters were encouraged to join the fun -- omitting the detail about the "bite". They nearly wore me out running upstairs to the electronics lab to recharge the capacitor, but we eventually worked through the entire prankster gang and achieved peace.

It was a 10µF capacitor charged to nearly 1000V. Note that this is quite a punch and it would not be a good idea to have the current path cross the torso. In this case the "sting" was contained entirely in the hand because the switch was enclosed in a metal surface box. As an extra safety factor the extended arm was in contact with a metal door frame.

Last edited by buzz on October 22, 2018 11:51.


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