RE: IR Question

[Stuart Whyte <lists@xxxxxxx>]

Ian,

Thanks for helping me explain what's needed!  :-)

S.

> -----Original Message-----
> From: ian.bird@xxxxxxx
> [mailto:ian.bird@xxxxxxx]
> Sent: 22 October 2002 15:18
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] IR Question
> 
> 
> 
> Nigel's circuit takes the demodulated signal from a TSOP and 
> the 'bus' is
> just this going from 0 to 5 volts. Normal state is high. The 
> rest of the
> extender simply takes this signal and uses it to turn a 555 
> circuit on and
> off to produce the 38KHz IR.  Not RF, that would be too easy.
> 
> What Stuart needs is something that will pull this 'bus' low 
> when IR is to
> be transmit and let it go high when no IR is needed. This 
> obviously happens
> at the speed of the demodulated IR encoding .
> 
> My guess is your penultimate paragraph covers it but you will need
to
> explain it in much more layman terms. Stuart is not an expert in
> electronics.
> 
> Ian
> 
> Ian Bird
> CibaVision UK Ltd.
> Direct dial 01489 775570
> Fax           01489
779570
> 
> 
>                                                              
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>                      
"Dan"                                  
>                                                                   
>                      
<dtoma@xxxxxxx>           
To:       
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<ukha_d@xxxxxxx>                                     
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cc:            
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>                      
22/10/02 14:38          
Subject:  Re: 
> [ukha_d] IR
Question                                               
>                      
Please respond
to                      
>                                                                   
>                      
ukha_d                                 
>                                                                   
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> 
> 
> 
> 
> > I currently have an IR extender (a'la Nigel Orr) between my 
> bedroom and
> my
> > Digibox in the living room.  What I want to do is have the
> output from
> Dan's
> > Autom8it plugin controlling the Digibox as well.
> 
> It is perfectly possible right now.
> 
> 
> > I would rather not have an IR emitter on the back of my PC
pointing
> straight
> > at a TSOP IR Receiver to add the signal onto the IR 
> extender bus.  Is it
> > possible to put the output from the PC straight onto the
bus??
> 
> I don't know your extender, but I have done it with the Alcad 
> IR extender
> (through the mains version).
> If it is RF based, then is much more simple (no need for opto 
> couplers).
> 
> You can take the signal from the DTR pin and using a single 
> transistor with
> the collector connected to the output of the IR receiver IC 
> (TSOP 17xx or
> similar). This is all.
> 
> Another simple posibility is to put a LED at the TxD output 
> through a small
> resistor and a reverse diode(for protection) in the front of 
> the extender
> receiver....then put IRM or infrared plugin in Tx mode and.. 
> again this is
> all... is after you which way you choose.
> 
> BR,
> Dan
> 
> 
> 
> 
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