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'Infra Red Eyes...'
2000\04\26@151217 by Nathan Hendler

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Can IR detection work if the IR source isn't modulated?  In most IR
robotics circuits (obsticle avoidance) I see, the circuit uses a shart
reciever, and modulates the IR source.  Cool enough, except...

My goal is to have more than one small robots that can chase or avoid
eachother (or interact, or whatever).  One IR emitter on the back, one or
two ir detectors on the front.  An 8pin PIC controlling the whole thing.
If these robots are always indoors, do I need to worry about modulating
the IR?  I was hoping to be able to get away with two IR detectors each
connected to an A/D port, so the PIC's could determine which detector is
detecting more IR.  Has anyone seen this done, know of a circuit or done
it themsleves?

I guess what I'm looking for is some knowledgeable advice on hooking up IR
detectors to A/D ports on a PIC.  I'm concerned about getting good 0-255
readings in different indoor lighting conditions.  Or mores specificaly,
I'm concerned about only getting 0 or 255 on both detectors except in very
specific lighting.

I'd also like to have an array of IR detectors hooked up to a PIC for A/D
conversion and then have the values sent to a computer via serial.  Seems
simple enough.  Anyone have any advice on multiplexing A/D lines?  I'd
like to have 8 rows of 8 IR detectors, so...  I'm not really sure how to
do that.

Thanks,
Nathan Hendler

2000\04\28@195320 by Mark Newland

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You can still detect range with a modulating IR.  Also, if you have each robot
at a different modulating frequency, you can detect which robot you are
chaseing by what frequency it is at.

Nathan Hendler wrote:

{Quote hidden}

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