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[DPRG] Multi-robot communication

Subject: [DPRG] Multi-robot communication
From: Justin Kao kaoj at its.caltech.edu
Date: Fri Aug 25 22:17:42 CDT 2000

Are you using the Sharp IR modules? Those are pretty good, they're used in
TVs and VCRs. But I've seen the matching IR LEDs in the remote control being
driving with huge amounts of current, like on the order of 500mA. Keep in
mind that this is pulsed though, and with some pretty fancy LEDs probably.
So you might try increasing your broadcast power by using something like 8
LEDs arranged in a circle. Also, try slowing down the rate of transmission
since I think the received modules take a little time to lock on (?), and
see if you can receive signals from your TV's remote control.


-----Original Message-----
>From: Sanjay Agrawal <sanjaya at home.com>
To: DPRG <dprglist at dprg.org>
Date: Friday, August 25, 2000 5:11 PM
Subject: [DPRG] Multi-robot communication

>I've been working on getting 2-3 robots to cooperate w/each other, and
>I've run into a small problem.  One robot pulses 38kHz IR to send bits,
>and another robot is supposed to receive the bits and take appropriate
>action.  But the IR is bouncing off walls, since it's normally used for
>obstacle avoidance, and so my follower robots can't locate the source
>robot.  Also, the reflected signal sometimes changes the bits a little,
>causing mis-communication.  I faintly remember reading/seeing a $20 RF
>module somewhere, but I've forgotten where.  Do you have any ideas for
>other ways (inexpensive, of course) that I could get the robots to
>communicate?  The only non-IR stuff I've found is Parallax's RF modules
>which cost $60-100.  And I don't need complex data to be sent back and
>forth - I only need to differentiate between about 5 different commands.
>-Sanjay Agrawal
>DPRGlist mailing list
>DPRGlist at dprg.org

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