RE: Nigel Orrs IR and Ians PC circuit

[Stuart Whyte <lists@xxxxxxx>]

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.=20=20

The original circuits still need power.=20=20

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=20
> 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=3Darticles&id=3D4&pagenum=3D3
=
=20

I think the idea is that this powers itself via the serial port, as there
i=
s
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	10=B5F, 16V (elco)	Capacitor=09=09
SC93B/YR75S/RA49D	100nF / 0.1=B5F	Capacitor
D4K7			Res 4.7K		Resistor
QL80B			1N4148		Signal Diode
QL26D			LM78L05ACZ		0.1A Fixed Regulator=20

Do this look about right?


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