hi james and everyone,
    I wonder if the strobe light will false trigger my IR sensors and
prevent my robot from getting close to it?? Is the strobe light just a
normal LED?? I am not too sure how to generate this strobe light. My IR
sensor module consists of an IR emitter and a receiver (i am using a
photodiode). Isn't the photodiode sensitive also to the strobe light?? or
any normal LED shining directly at it??
    Hope to hear from you soon.

Henry

----- Original Message -----
From: "James Burkart" <grafxjkb@PACBELL.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, December 23, 2000 1:12 PM
Subject: Re: [OT] Sound Detector


>         What about using a strobe light instead of a sound? Mount two CdS
photo
> cells facing the same way (eyes for the robot), and put a card between
them.
> Design a circuit to compare the difference of light levels between the
> detectors. When the levels are equal you are facing the strobe. An easy
way
> to compare the input from the CdS's is to use an op-amp as a comparator.
> It's sooo much easier to measure the difference between light levels than
it
> is to measure sound. I suppose that if you were to stay with the sound
> instead of using light you might want to use a similar method to direct
your
> robot.
>
> James Burkart
>
> -----Original Message-----
> From: pic microcontroller discussion list
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Henry Low
> Sent: Friday, December 22, 2000 2:54 AM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: [OT] Sound Detector
>
>
> Hi all,
>     Seasons Greetings.
>     I was thinking of implementing beacons in a robot testing arena that
> emits sonar signals or a buzzy sound for the robot to move towards. And
the
> beacon will be turned off upon sensing the robot's presence (which means
the
> beacon has got it's own sensor too). My aim is to see how fast the robot
is
> able to disable say 10 beacons in a reasonable robot testing ground. Is
this
> idea feasible?? How can I make the robot move closer to the buzzy sound
(can
> be modulated)?? Does it involve a complicated algorithm for it's decision
to
> move towards the beacon?? Any help, comments are most welcome.
>
> Regards,
> Henry
>
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