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Electronics => Electronics => Topic started by: shyamgenious on April 30, 2011, 10:28:56 AM

Title: non light sensing diode??
Post by: shyamgenious on April 30, 2011, 10:28:56 AM

The subject may have confused what i am about to discuss about but does anybody have an idea how tomake a light sensing diode set out a signal for current to flow when suddenly inturrupted because of not recieving light for a moment??LIKE if directed a laser beam to the diode and if somebody puts his hand in between,the diode stops recieving light momentarily and sends a signal to activate an alarm and makes the person this :-[ :-[ :-[ :-X :-X ??? ??? >:( >:(. any ideas for doing this??
and i have a pen laser light so i also need to know how i can connect it to the mains?? ive made a wall wart to regulate output till 12 volts.

Title: Re: non light sensing diode??
Post by: Soeren on April 30, 2011, 05:45:13 PM

Hi,

You really ought to search the forum before asking.
(And please reserve the colors and emoticons for where it really helps the post, if anything, it makes your posts harder and quite annoying to read).

Quote from: shyamgenious on April 30, 2011, 10:28:56 AM

[...] does anybody have an idea how tomake a light sensing diode set out a signal for current to flow when suddenly inturrupted because of not recieving light for a moment?

http://www.societyofrobots.com/robotforum/index.php?topic=13076.msg97347#msg97347 (http://www.societyofrobots.com/robotforum/index.php?topic=13076.msg97347#msg97347)

Quote from: shyamgenious on April 30, 2011, 10:28:56 AM

and i have a pen laser light so i also need to know how i can connect it to the mains?? ive made a wall wart to regulate output till 12 volts.

http://www.societyofrobots.com/robotforum/index.php?topic=13409.msg99393#msg99393 (http://www.societyofrobots.com/robotforum/index.php?topic=13409.msg99393#msg99393)

Title: Re: non light sensing diode??
Post by: hopslink on May 01, 2011, 12:38:47 AM

Quote

...it makes your posts harder and quite annoying to read

It would seem that this is the point of all Shyam's posts.

I suspect garretg84 has sniffed him out (http://www.societyofrobots.com/robotforum/index.php?topic=13526.msg100081#msg100081).

Title: Re: non light sensing diode??
Post by: Bernhard on May 03, 2011, 04:17:30 PM

Use a photodiode and an infrared diode config. Something like this...(http://www.cosasdemecatronica.com/images/stories/proyectos/electronica/sensor_infrarrojo/imagenes/sensor_infrarrojo.jpg)

Title: Re: non light sensing diode??
Post by: Soeren on May 03, 2011, 05:56:41 PM

Hi,

Quote from: Bernhard on May 03, 2011, 04:17:30 PM

Use a photodiode and an infrared diode config. Something like this...

That will only do for very a short distance (Won't even cover a doorway).