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Where to place a motion sensor?

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DaOld Man:
I dont think that sensor will work right if you remove the lens. That Fresnel lens is made to focus the infrared onto the sensor.
I put together a Game cam (wildlife game not mame) for a friend once.
I tried removing the lens from a sensor similar to that, it didnt work, but it might still work up close, I cant remember. Game cams are set for 10-30 feet detection.
I like the idea of a Hal type attachment.

weisshaupt:
The HAL attachment idea is a good one - i used the same Idea when I was doing my modular panels and decided to make the seams between the panels obvious rather than try to hide them... if you can't hide it acting like you wanted it that way is the next best thing.

I still think a smoked plexi or glass may do the trick.. no need to go custom - Lots of PLastic and glass places carry such stuff in stock and you will only need a remnant of something they already cut up.. You may pick up the piece you need for a song.

You can also make a bigger hole, or route out some material round the hole in increase the range/detection ability.


However, I do think  DA Old MAn is right about the fresnel lens, you would need to leave that on..

Looks like it experimentation time with different materials :>)

thatdecade:
I finished this in June, but didn't get around to writing anything up till now.  I ended up placing it on the floor angled up slightly.  I keep a table on that side of the cabinet so the motion sensor is out of sight.

Power is controlled by the PC screensaver.  Motion sensor holds down a keyboard key for a few seconds when triggered.  This brings the PC out of screensaver and turns on the monitor, lights, and sound.  If no more motion is seen and no button on the control panel is pressed after 10 minutes, screensaver activates and everything turns back off.

Notes about my power control circuits are on this page.
http://www.westaby.net/arcadeRevisted.html

RandyT:

Cool concept. 

BTW, if anyone is still interested in a confirmation of one of the earlier suggestions, that dark smoke plexi is virtually invisible to IR.  Years ago when I first started advocating it's use in Arcade machines to hide the monitor orientation and increase contrast, I was also using a TV set in my cab.  The IR remote went right through it like it wasn't even there.

RandyT

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