RE: RE: Nigel Orrs IR and Ians PC circuit

[Robert Chasmer <robert.chasmer@xxxxxxx>]

ian.bird@xxxxxxx wrote:
> Your current board(s) will have a power supply somewhere to make them
> work. This power supply gives the bus power and the TSOP's simply
> grounds  or doesn't ground this bus. The bus is connected to the 555
> chip which is turned on and off depending on the bus state.
> The PC connection simply emulates the TSOP. From the serial port
> one of the connections is used to feed the base of a transistor
> (switch) through a resistor and this switch grounds or otherwise
> the bus.

Stuart/Ian thanks for your replies.  I think I understand nigels circuit
and
what the TSOPs do.  The TSOPs pull the bus low during IR activity, and so I
need the serial port to do the same thing.  But could I have a little more
detail please on how the serial port will act like a TSOP.

The IR sender circuit I have already has transistor switch feeding the
trigger on the 555 timer as per Nigels diagram
http://www.geocities.com/nigelorr/ir_extend.html.
 So coming out of the
serial port do I need an additional transistor switch, and what pin on the
serial port is supposed to feed it (Is it pin 3 Tx?).  A little diagram
showing what components to use and how to connect them up would be a great
help.

I think my main problem is the limited electronics knowledge I have is all
mixed up and wolley.


> The only common connection is ground which has to be connected
together
> so both devices are batting on the same 'ground' (excuse the pun).

:-) Ok, my bus consists of +12v, signal, 0v.  Each reciever/transmitter
circuit can have its own power, but they need to share the signal and 0v.


Rob

I feel like I need to go back to school and learn all about electronics
again.  It all seems like years ago... well it was :-(
--
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>
>
>
>
>
>
> Stuart Whyte <lists@xxxxxxx>
> 25/04/2003 09:36
> Please respond to ukha_d
>
>
>         To:     "'Robert Chasmer'"
<robert.chasmer@xxxxxxx>
>         cc:     "UKHA (E-mail)" <ukha_d@xxxxxxx>
>         Subject:        [ukha_d] RE: Nigel Orrs IR and Ians PC circuit
>
>
> Rob,
>
> Not being electronically minded, I will try to explain as
> best I can, but
> I'm sure Ian will be able to explain more.
>
> The circuit that Ian built for me has a transistor switch
> controlled by
> the
> serial port.  This then puts a signal on the bus line and
> controls the TX
> module.
>
> The original circuits still need power.
>
> HTH, but like I say, Ian's explanation will be FAR better
> than  mine. ;-)
>
> Stuart
> -----Original Message-----
> From: Robert Chasmer [mailto:robert.chasmer@xxxxxxx]
> Sent: 25 April 2003 00:56
> To: 'ukha_d@xxxxxxx'
> Cc: 'lists@xxxxxxx'
> Subject: Nigel Orrs IR and Ians PC circuit
>
>
> Way back in Dec 2002 Stuart Whyte [mailto:lists@xxxxxxx] wrote:
> > Saturday morning saw the arrival of a jiffy bag containing a
custom
> > made circuit board from Ian Bird that allows me to connect my PC
> > serial port to the IR signal bus of the Nigel Orr designed IR
> > extender, that is already running through the flat.
> > After a trip to Maplins, who (amazing as it may seem) had all
> > the parts in stock to construct an IR Receiver circuit
> > http://www.lirc.org/images/schematics.gif
to teach the PC my remote
> > commands.
>
> Stuart/Ian, I have Nigel's circuit running through the house
> as well. With
> the arrival of a new PC at the beginning of the year I'm now ready to
> connect it to the IR bus and finally have a play with Dans IR
> software.
>
> I see the circuit connected to your PC has a TSOP which is
> for receiving
> IR.
> To inject IR on the bus for Nigel's sender circuit do you
> just connect
> this
> receiver in parallel with other TSOPs?.
>
> The TSOPs I've used with Nigel's circuit are 1838's that I
> got from Keith,
> rather than 1738's which I think have a slightly different
> pinout.  I've
> found a very similar circuit to the one on lirc but that uses
> the 1838's,
> with a good tutorial:-
> * http://www.meblin.karoo.net/infrared.htm
> * http://www.heatseekerz.net/index.php?page=articles&id=4&pagenum=3
>
> I think the idea is that this powers itself via the serial
> port, as there
> is
> no mention of a separate powersupply.  So my question is to I
> only need to
> connect the OUT (Pin 3), and GND (Pin 2) to my other circuits
> to do the
> trick?
>
> I've guessed at some maplin codes, I'm not sure if I got the right
> components:-
> Maplin                           Part  Description
> VH06G/AT02C/DT55K                10µF, 16V (elco)
>    Capacitor
>
> SC93B/YR75S/RA49D                100nF / 0.1µF           Capacitor
> D4K7                                             Res 4.7K
>    Resistor
> QL80B                                            1N4148  Signal Diode
> QL26D                                            LM78L05ACZ      0.1A
> Fixed Regulator
>
> Do this look about right?
>
>
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