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Re: portable loud sound and infra red

From: jim ruxton   cinetronpassport.ca
Date: Sat, 7 May 2005 11:54:03 -0700

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Hi Sam 
> 

> 
> i've never built anything like this before and so would really 
> appreciate some advice from anyone who could suggest suitable 
> equipment.. ie what kind of power supply/amplifier and drivers would be 
> best to use.. there is a fairly limited budget so i need to build this 
> on the cheap!
Definitely a job for car stereo equipment. Since these are commodity
items you should be able to find something cheap and LOUD. The benefit
to car audio being that it runs on 12 VDC. You could get a small car
battery and charger and charge it every night before using it.
Alternatively you could install a battery powered blaster. For even more
fun cover the coffin lid with solar panels to charge your batteries
during the day.. 
> 
> 
> My second question is about infra red remote control.. is it possible 
> to use a large number of infra-red transmitters simultaneously, or 
> would they interfere with each other? I am hoping to have perhaps 20 
> small robots on the floor of a large room, and to have them each send 
> signals via infra-rd to a receiver(s) on the ceiling to trigger sounds 
> or other events if they bump into something. Is it feasible to use 
> multiple infra red transmitters together like this? I was thinking each 
> robot would send a unique signal that can be specifically distinguished 
> from the others.. but i'm not sure whether the receiver might just get 
> swamped with infra-red light...
Others may have better answers to this but I think this would be
difficult without getting fancy. If each robot was transmitting on the
same modulation frequency and they transmitted at the same time garble
garble garble. One way around this would be to have a polling situation
where there is a transmitter on the ceiling sending out messages to each
robot sequentially and saying ok your turn bot 1, your turn bot 2 etc.
Of course this means you also need receivers on the robots. Maybe
someone else has some clever ideas. 
jim 
> 
> any thoughts greatly appreciated,
> 
> thanks,
> 
> Sam.
> 
> 
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