[Robotgroup] mission accomplished

[Marvin Niebuhr]

Fantastic Andre, you might see the results at Dorkbot.  Marvin

On Feb 22, 2008, at 10:17 PM, Andre Lamothe wrote:

> 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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