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RE: IR Question



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
>
>
>                                                              
>                                                                   
>                       "Dan"                                  
>                                                                   
>                       <dtoma@xxxxxxx>            To:      
> <ukha_d@xxxxxxx>                                     
>          
>                                                cc:           
>                                                              
    
>                       22/10/02 14:38           Subject:  Re:
> [ukha_d] IR Question                                               
>                       Please respond to                      
>                                                                   
>                       ukha_d                                 
>                                                                   
>                                                              
>                                                                   
>                                                              
>                                                                   
>
>
>
>
> > 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
>
>
>
>
> http://www.automatedhome.co.uk
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