[Robotgroup] mission accomplished

[Andre Lamothe]

Sure, just get a simple visible light detector, basically a transistor or a 
resistor, then you might want to put a red filter over it to try and reduce 
the chance that ambient light sets it off, then you need to put that in the 
base or control circuit of the lights and have it as part of the drive 
circuit. So you might look up "light triggered circuit" for example. Now the 
problem you will have is ANY visible light will trigger it as well, so you 
might have to put the trigger in a little tube, then perpendicular to the 
sun, or parallel to the ground, then with a lot of red filter plastic over 
it, it should respond pretty well to the red (or green) laser and then 
trigger.

If you wanted to do it better, then you would modulate the laser, so "dc" 
signals like the sun wouldn't cause problems.

But, something like this will work if you want to close a relay:

http://www.ozitronics.com/docs/k79a.pdf


Andre'

----- Original Message ----- 
From: "Marvin Niebuhr" <marvart at txwinet.com>
To: "The Robot Group Mailing List" <robotgroup at puremagic.com>
Sent: Friday, February 22, 2008 9:32 PM
Subject: [Robotgroup] mission accomplished


Thanks Andre, Vern, Doug, the frogs are lighted up!  Next question-- 
Is there a simple sensor that will respond to a cheap laser pointer
that I have. I want to trigger a sound effect at about 25'.
   Marvin
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