Sniffing out IR remote control codes with a PC

S

Steve S

Guest
Hi,

I seem to remember seeing a simple circuit for connection to a PC's RS232
port and software (DOS/Windows) for sniffing out the codes being transmitted
by IR remote control handsets. FWIW I'm only interested in sniffing out
handsets that use the NEC protocol.

I've Googled for a while, but so far only found circuits that use PICs
etc. - I'm sure it was done with just an IR receiver and some discrete
components. If someone knows of something suitable, then could you please
let me know.

Many thanks,
Steve
 
On Thu, 25 Nov 2004 11:33:50 GMT, "Steve S" <me@privacy.net>
wrote:

Hi,

I seem to remember seeing a simple circuit for connection to a PC's RS232
port and software (DOS/Windows) for sniffing out the codes being transmitted
by IR remote control handsets. FWIW I'm only interested in sniffing out
handsets that use the NEC protocol.

I've Googled for a while, but so far only found circuits that use PICs
etc. - I'm sure it was done with just an IR receiver and some discrete
components. If someone knows of something suitable, then could you please
let me know.

Many thanks,
Steve
Click to expand...
The below is about as simple as it gets. The recorded info can be
saved as a text file for evaluation using the EZ59 software. The
USB-UIRT is a nothe gizmo that might be of interest.

http://www.ziplabel.com/cir/index.html
http://dishhead.home.insightbb.com/dishhead.html
http://www.usbuirt.com/
 
"Si Ballenger" <shb*NO*SPAM*@comporium.net> wrote in message
news:41a5fe09.81245324@news.comporium.net...
On Thu, 25 Nov 2004 11:33:50 GMT, "Steve S" <me@privacy.net
wrote:

Hi,

I seem to remember seeing a simple circuit for connection to a PC's RS232
port and software (DOS/Windows) for sniffing out the codes being
transmitted
by IR remote control handsets. FWIW I'm only interested in sniffing out
handsets that use the NEC protocol.

I've Googled for a while, but so far only found circuits that use PICs
etc. - I'm sure it was done with just an IR receiver and some discrete
components. If someone knows of something suitable, then could you please
let me know.

Many thanks,
Steve

The below is about as simple as it gets. The recorded info can be
saved as a text file for evaluation using the EZ59 software. The
USB-UIRT is a nothe gizmo that might be of interest.

http://www.ziplabel.com/cir/index.html
http://dishhead.home.insightbb.com/dishhead.html
http://www.usbuirt.com/
Click to expand...
Thanks a lot Si. The circuits are just what I am looking for (the receiver
parts). The USB-UIRT looks very interesting too. I've got to check out the
software since I really want a dump of the NEC codes being transmitted,
rather than being able to learn them for later retransmission - I wonder if
the EZ59 software can do this, or how hard it is to decode the raw text
files? Alternatively, maybe the Girder s/w can when running from the UIRT -
I'll look into it.

For anyone's who is interested, I'm going to be zapping it with all the
settings from a one-for-all universal remote and want to have a record of
all the NEC customer codes used - we're designing a remotely controlable
unit and don't want it to clash with any codes already in common use - our
first unit used a customer code chosen at random, and we found out somewhat
later that it did clash with some Toshiba TVs! :(

Cheers,
Steve
 
On Thu, 25 Nov 2004 17:26:32 GMT, "Steve S" <me@privacy.net>
wrote:

"Si Ballenger" <shb*NO*SPAM*@comporium.net> wrote in message
news:41a5fe09.81245324@news.comporium.net...
On Thu, 25 Nov 2004 11:33:50 GMT, "Steve S" <me@privacy.net
wrote:

Hi,

I seem to remember seeing a simple circuit for connection to a PC's RS232
port and software (DOS/Windows) for sniffing out the codes being
transmitted
by IR remote control handsets. FWIW I'm only interested in sniffing out
handsets that use the NEC protocol.

I've Googled for a while, but so far only found circuits that use PICs
etc. - I'm sure it was done with just an IR receiver and some discrete
components. If someone knows of something suitable, then could you please
let me know.

Many thanks,
Steve

The below is about as simple as it gets. The recorded info can be
saved as a text file for evaluation using the EZ59 software. The
USB-UIRT is a nothe gizmo that might be of interest.

http://www.ziplabel.com/cir/index.html
http://dishhead.home.insightbb.com/dishhead.html
http://www.usbuirt.com/


Thanks a lot Si. The circuits are just what I am looking for (the receiver
parts). The USB-UIRT looks very interesting too. I've got to check out the
software since I really want a dump of the NEC codes being transmitted,
rather than being able to learn them for later retransmission - I wonder if
the EZ59 software can do this, or how hard it is to decode the raw text
files? Alternatively, maybe the Girder s/w can when running from the UIRT -
I'll look into it.
Click to expand...
A google search will pull up a lot of circuits. If the baseband
frequency is ~38khz, you could use an IR decoder (radio shack
~$4) to get just the pulses, and vire these using an O-scope
program

For anyone's who is interested, I'm going to be zapping it with all the
settings from a one-for-all universal remote and want to have a record of
all the NEC customer codes used - we're designing a remotely controlable
unit and don't want it to clash with any codes already in common use - our
first unit used a customer code chosen at random, and we found out somewhat
later that it did clash with some Toshiba TVs! :(

Cheers,
Steve
Click to expand...
 
On Fri, 26 Nov 2004 08:30:43 GMT, "Steve S" <me@privacy.net>
wrote:


Thanks. TBH I already have a digital storage scope and an IR receiver
module - I just can't get the codes out without looking at each waveform by
hand. I might have a go at writing some PC s/w to decode the NEC codes
coming in via the printer port using one of the circuits you've pointed me
too (I was just being lazy I guess hoping there was software already done!)
Click to expand...
You might go to the below site to see if they already have the
codes you need.

http://www.remotecentral.com/files/index.html
 
Steve S <me@privacy.net> wrote:
<snip>
Thanks. TBH I already have a digital storage scope and an IR receiver
module - I just can't get the codes out without looking at each waveform by
hand. I might have a go at writing some PC s/w to decode the NEC codes
coming in via the printer port using one of the circuits you've pointed me
too (I was just being lazy I guess hoping there was software already done!)
Click to expand...
Alternatively, use the soundcard.
 
http://www.redrat.co.uk/RedRat3/

Steve S wrote:

Hi,

I seem to remember seeing a simple circuit for connection to a PC's RS232
port and software (DOS/Windows) for sniffing out the codes being transmitted
by IR remote control handsets. FWIW I'm only interested in sniffing out
handsets that use the NEC protocol.

I've Googled for a while, but so far only found circuits that use PICs
etc. - I'm sure it was done with just an IR receiver and some discrete
components. If someone knows of something suitable, then could you please
let me know.

Many thanks,
Steve
Click to expand...
 
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