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Gadget Freak

Gadget Freak Case #266: The Window Watcher

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Pete Lefferson
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Iron
Re: Good Idea But What About Random Critters?
Pete Lefferson   10/28/2014 2:12:30 PM
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No animals close to the ground do not set it off.   

There are a couple things going here.

1.  The law of inverse squares that says sensitivity goes down with the square of the distance.

2.  There maybe little contrast with an animal at ground level and the heat radiated by the ground it self.

3.  These thermal systems are sensitive only to a change in heat and as you go out the change becomes more gradual as a hot object passes through the sensor's wider window.

Thanks for the question.

Daniyal_Ali
User Rank
Platinum
Re: Good Idea But What About Random Critters?
Daniyal_Ali   10/28/2014 8:51:43 AM
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How does it work? Is there some sensing or control mechanism that avoids the false alarm? Because i didn't find anything relevant in the parts-list.

NadineJ
User Rank
Platinum
Re: Good Idea But What About Random Critters?
NadineJ   10/28/2014 1:37:04 AM
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Looks like it's good for stalkers and peepers who are close by.  For urbanites, we need more protection from the guy/gal with the binoculars two buildings over.

fdos
User Rank
Iron
Re: Good Idea But What About Random Critters?
fdos   10/27/2014 11:35:31 PM
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@78RPM: Well that's something new for me. A good move indeed

78RPM
User Rank
Platinum
Re: Good Idea But What About Random Critters?
78RPM   10/27/2014 5:47:40 PM
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Pete, here's a friendly and helpful tip about this blog. If you make a typo or other error, you can just click on the time/date stamp next to your name and edit or delete your comment. Cool, huh?

Kim
User Rank
Iron
Re: patents
Kim   10/27/2014 5:03:34 PM
NO RATINGS
Our company is in the same situation; we would not have the money to defend any of our patents in court.  However, we aggressively look for a ways to patent our ideas as long as we think we can get claims allowed that will lock out our competition.  All of our patents involve consumer products that are made in China and sold through US retailers.  So far they have been effective in keeping us from getting knocked off.  You can certainly find China manufacturer's that will build whatever you want (and unless you have international patents that cover China, they are not violating any laws), but most US retailers are very sensitive to patent issues.

Nancy Golden
User Rank
Platinum
Re: No Schematic
Nancy Golden   10/27/2014 3:59:51 PM
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A patent attorney can almost always get someone a patent by making the claims so narrow that they do not really protect the invention.  In these cases, it can be relatively easy to avoid infringement just by changing one little element of the design.  There is nothing unethical about this.  It is the inventor's responsibility to make sure the claims really protect the invention.


And this statement is exactly why I have not pursued any patents as a small business owner. My husband and I have several unique designs but no deep pockets to defend them. If someone started manufacturing our products and we wanted to try to prosecute their infringement of our designs, it would be up to us to assume all of the up-front court costs until a verdict was rendered and we could in no way afford to do that.

Pete Lefferson
User Rank
Iron
Re: Good Idea But What About Random Critters?
Pete Lefferson   10/27/2014 3:46:43 PM
NO RATINGS
No, animals close to the ground do not set it off.

Pete Lefferson
User Rank
Iron
Re: Good Idea But What About Random Critters?
Pete Lefferson   10/27/2014 3:43:01 PM
NO RATINGS
That is a good question.   No,  animales close to the ground do not set it off.

Pete Lefferson
User Rank
Iron
Re: 9V on a 6V part?
Pete Lefferson   10/27/2014 3:38:23 PM
NO RATINGS
Yes, you are correct,  as I just wrote,  the China part I used had a higher voltage ratting.   Then a couple years later when preparing my article I thought I had found the exact same part from Parallex.   I should have been more careful and check the max voltage.   My error.

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