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RE: IR Question




Hi Stuart

I will look tonight as it is a long while since I did these boards. I'll
let you know.

Ian

Ian Bird
CibaVision UK Ltd.
Direct dial 01489 775570
Fax           01489 779570


                                                                                                                                
                      Stuart Whyte                                                                                              
                      <lists@futureflat        To:       "'ukha_d@xxxxxxx'" <ukha_d@xxxxxxx>                    
                      .org>                    cc:                                                                              
                                               Subject:  RE: [ukha_d] IR Question                                               
                      22/10/02 15:30                                                                                            
                      Please respond to                                                                                         
                      ukha_d                                                                                                    
                                                                                                                                
                                                                                                                                




Great thanks Dan,

Do you recommend a part number for said NPN transistor, that I can get from
Maplins??  Also, remind me of the URL for the circuit to get Autom8it to
learn the IR Commands.  Can these go on the same COM port??

Ian, am I right in saying that R7 is the bus terminal on the TX board??

Cheers

S.

> -----Original Message-----
> From: Dan [mailto:dtoma@xxxxxxx]
> Sent: 22 October 2002 15:22
> To: ukha_d@xxxxxxx > Subject: Re: [ukha_d] IR Question
>
>
> > The extender I use is here:
> http://www.geocities.com/nigelorr/ir_extend.html
>
> I see it... so you can go directly to the bus from the serial port.
>
>
> >> 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.
>
> > Could you explain this a bit more? I'm looking to make the
> PC transmit to
> > the bus
>
> Ok.. now that I have seen your interface, this is what you must do:
>
> - from the DTR line on the COM port through a 10K to 22K
> resistor go to the base of a NPN transistor (any type).
> - connect the transistor emitter to the ground (together with
> the pin 5 of the COM port);
> - connect the transistor colector to the left pin of R7 (2K)
> from your schematic.
>
> ..and.. this is all.... don't forget to put the application
> in DTR mode (TxD checkbox unchecked)
> So all you need is a NPN transistor and a 10K to 22K resistor...
>
> > I really want to take the optical part out of the equation
>
> Now is out..:-)))
>
> Dan
>
>
> [Non-text portions of this message have been removed]
>
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