Infrared help
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Posts: 46,084
I picked up a pack of infrared emitters and detectors (radio
shack). I have no experience with IR yet. I could not find any help
with this topic in the BS manual. On the web site I found DLs of
sample programs, yet they offered no help since I do not know the
wiring for IR components.
Any help using IR will be appreciated.
Thanks
CJS
shack). I have no experience with IR yet. I could not find any help
with this topic in the BS manual. On the web site I found DLs of
sample programs, yet they offered no help since I do not know the
wiring for IR components.
Any help using IR will be appreciated.
Thanks
CJS
Comments
the FREQOUT command. Even though the FREQOUT has a ceiling of 32,767
Hz, enough harmonics are generated to modulate the LED. You can
download any of our robotics oriented code to see this in action.
Here's a bit of code from our Sumo robot:
Read_IR_Sensors:
FREQOUT LfIrOut, 1, 38500 ' modulate left IR LED
irLeft = ~LfIrIn ' read input (1 =
target)
FREQOUT RtIrOut, 1, 38500 ' modulate right IR LED
irRight = ~RtIrIn ' read input (1 =
target)
RETURN
The trick is to receiver. We use Panasonic receivers that stay active
for a bit of time after the removal of the IR signal. This is important
as it allows the Stamp time to move to the next instruction (looking at
the receiver output).
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: Christopher [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=xBRXh1xvHJg_-6kusFbfXwzDVe2mk8PUS9KdP_YwLj9cGWVdFQxWjJbswbWRHo1qRsPqVjGkuys]cj193@y...[/url
Sent: Monday, December 22, 2003 12:57 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Infrared help
I picked up a pack of infrared emitters and detectors (radio
shack). I have no experience with IR yet. I could not find any help
with this topic in the BS manual. On the web site I found DLs of
sample programs, yet they offered no help since I do not know the
wiring for IR components.
Any help using IR will be appreciated.
Thanks
CJS
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abuse@p....
output high. Can I create a delay with a cap. in parallel?
Also for the emitter, it needs to use the freqout command. This
means I cannot just hard wire the emitter high?
Thanks for you help
Chris
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> IR LEDs need to be modulated (usually 38.5 kHz). You can do this
with
> the FREQOUT command. Even though the FREQOUT has a ceiling of
32,767
> Hz, enough harmonics are generated to modulate the LED. You can
> download any of our robotics oriented code to see this in action.
> Here's a bit of code from our Sumo robot:
>
> Read_IR_Sensors:
> FREQOUT LfIrOut, 1, 38500 ' modulate left IR
LED
> irLeft = ~LfIrIn ' read input (1 =
> target)
> FREQOUT RtIrOut, 1, 38500 ' modulate right
IR LED
> irRight = ~RtIrIn ' read input (1 =
> target)
> RETURN
>
> The trick is to receiver. We use Panasonic receivers that stay
active
> for a bit of time after the removal of the IR signal. This is
important
> as it allows the Stamp time to move to the next instruction
(looking at
> the receiver output).
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
output high. Can I create a delay with a cap. in parallel?
Also for the emitter, it needs to use the freqout command. This
means I cannot just hard wire the emitter high?
i also need to know how to wire each component.
Thanks for you help
Chris
>
>
>
>
>
> --- In basicstamps@yahoogroups.com, "Jon Williams"
<jwilliams@p...>
> wrote:
> > IR LEDs need to be modulated (usually 38.5 kHz). You can do
this
> with
> > the FREQOUT command. Even though the FREQOUT has a ceiling of
> 32,767
> > Hz, enough harmonics are generated to modulate the LED. You can
> > download any of our robotics oriented code to see this in action.
> > Here's a bit of code from our Sumo robot:
> >
> > Read_IR_Sensors:
> > FREQOUT LfIrOut, 1, 38500 ' modulate left
IR
> LED
> > irLeft = ~LfIrIn ' read input (1 =
> > target)
> > FREQOUT RtIrOut, 1, 38500 ' modulate right
> IR LED
> > irRight = ~RtIrIn ' read input (1 =
> > target)
> > RETURN
> >
> > The trick is to receiver. We use Panasonic receivers that stay
> active
> > for a bit of time after the removal of the IR signal. This is
> important
> > as it allows the Stamp time to move to the next instruction
> (looking at
> > the receiver output).
> >
> > -- Jon Williams
> > -- Applications Engineer, Parallax
> > -- Dallas Office
receivers (the modulation is used to prevent other IR sources from
causing a false trigger). So no, you can't simply wire the LED high --
you could, however, drive it full-time with a 555 timer circuit. If you
do, then the delay receiver delay that we use in our robots won't
matter, since you'll not be using FREQOUT to do the modulation, you'll
just be looking at the output of your receiver.
Our BS1 App Notes have the schematic for a 555 circuit you can use to
modulate your IR LEDs.
-- Jon Williams
-- Applications Engineer, Parallax
-- Dallas Office
Original Message
From: Christopher [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=ftH1YJE_OZNuooHxZQmN-c0X2hnxTU7YJoqe_6OaDCR9CE7IjS39h48L9RY81k2HoumKbuhZoEU]cj193@y...[/url
Sent: Monday, December 22, 2003 2:08 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Infrared help
You mentioned that the receiver that you use has a delay to keep the
output high. Can I create a delay with a cap. in parallel?
Also for the emitter, it needs to use the freqout command. This
means I cannot just hard wire the emitter high?
Thanks for you help
Chris
--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> IR LEDs need to be modulated (usually 38.5 kHz). You can do this
with
> the FREQOUT command. Even though the FREQOUT has a ceiling of
32,767
> Hz, enough harmonics are generated to modulate the LED. You can
> download any of our robotics oriented code to see this in action.
> Here's a bit of code from our Sumo robot:
>
> Read_IR_Sensors:
> FREQOUT LfIrOut, 1, 38500 ' modulate left IR
LED
> irLeft = ~LfIrIn ' read input (1 =
> target)
> FREQOUT RtIrOut, 1, 38500 ' modulate right
IR LED
> irRight = ~RtIrIn ' read input (1 =
> target)
> RETURN
>
> The trick is to receiver. We use Panasonic receivers that stay
active
> for a bit of time after the removal of the IR signal. This is
important
> as it allows the Stamp time to move to the next instruction
(looking at
> the receiver output).
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
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abuse@p....
i have an invoca LCD touch screen remote for my TV and stuff. the remote
has a learn feature so i can learn different IR codes from different IR
sources. do you think i can send a Serout command from the stamp to store
in the remote and when i press the button on the remote i will send to the
stamp the same IR code. would i use a photo transistor or the 40 KHz
receiver to read the code from the remote.
Here is the plan.
1) send code to the remote from the stamp using a IR LED (Send via Serout)
2) Store that code into the remote.
3) transmit that code back to the stamp receiving it via photo transistor
or 40 KHz receiver
4) based on the code received activate relays.
Thanks to all that can help,
Rgards,
Gary Denison II
Qualcomm Inc.
[noparse][[/noparse]Non-text portions of this message have been removed]
to achieve this.
From most primitive to most sophisticated, they are:
1. Install an IR-LED and 40 KHz IR-Detector
on your BOE. The IR-Detector will detect IR
pulses at 40 KHz or so, and drive a signal low
when it sees them. Program your Stamp to use the
Sony protocol to transmit with the IR-LED PULSOUT()
and decode the Sony protocol (See Parallax docs)
using PULSIN() from the IR-Detector. $10.00
2. Buy the Parallax IR card, which has the IR-LED
and IR-Detector on-card. Program for the Sony
protocol as above. $15.00.
3. Buy the Parallax IR-Buddy ($30.00(?)). This
has the Phillips RC-5 protocol built in to a
co-processor. Uses 232, MUCH easier to program,
and the IR-Buddy will recieve and hold up to
4 keypresses until your Stamp can get around
to them. Tell your remote to use the Phillips,
or RC-5 code, and go for it.
As a first try, I'd use the IR-Buddy.
'Roll your own' only makes sense if you can't
use the Phillips RC-5 protocol.
--- In basicstamps@yahoogroups.com, Gary Denison <gdii@c...> wrote:
> Hey guys, im in a jam and i need assistance.
> i have an invoca LCD touch screen remote for my TV and stuff. the
remote
> has a learn feature so i can learn different IR codes from
different IR
> sources. do you think i can send a Serout command from the stamp to
store
> in the remote and when i press the button on the remote i will send
to the
> stamp the same IR code. would i use a photo transistor or the 40
KHz
> receiver to read the code from the remote.
>
> Here is the plan.
> 1) send code to the remote from the stamp using a IR LED (Send via
Serout)
> 2) Store that code into the remote.
> 3) transmit that code back to the stamp receiving it via photo
transistor
> or 40 KHz receiver
> 4) based on the code received activate relays.
>
> Thanks to all that can help,
>
> Rgards,
>
>
>
> Gary Denison II
> Qualcomm Inc.
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
Regards,
Gary Denison II
Qualcomm Inc.
At 06:32 AM 2/25/2004, you wrote:
>There are a couple of routes you can take
>to achieve this.
>
> From most primitive to most sophisticated, they are:
>
>1. Install an IR-LED and 40 KHz IR-Detector
>on your BOE. The IR-Detector will detect IR
>pulses at 40 KHz or so, and drive a signal low
>when it sees them. Program your Stamp to use the
>Sony protocol to transmit with the IR-LED PULSOUT()
>and decode the Sony protocol (See Parallax docs)
>using PULSIN() from the IR-Detector. $10.00
>
>2. Buy the Parallax IR card, which has the IR-LED
>and IR-Detector on-card. Program for the Sony
>protocol as above. $15.00.
>
>3. Buy the Parallax IR-Buddy ($30.00(?)). This
>has the Phillips RC-5 protocol built in to a
>co-processor. Uses 232, MUCH easier to program,
>and the IR-Buddy will recieve and hold up to
>4 keypresses until your Stamp can get around
>to them. Tell your remote to use the Phillips,
>or RC-5 code, and go for it.
>
>As a first try, I'd use the IR-Buddy.
>'Roll your own' only makes sense if you can't
>use the Phillips RC-5 protocol.
>
>--- In basicstamps@yahoogroups.com, Gary Denison <gdii@c...> wrote:
> > Hey guys, im in a jam and i need assistance.
> > i have an invoca LCD touch screen remote for my TV and stuff. the
>remote
> > has a learn feature so i can learn different IR codes from
>different IR
> > sources. do you think i can send a Serout command from the stamp to
>store
> > in the remote and when i press the button on the remote i will send
>to the
> > stamp the same IR code. would i use a photo transistor or the 40
>KHz
> > receiver to read the code from the remote.
> >
> > Here is the plan.
> > 1) send code to the remote from the stamp using a IR LED (Send via
>Serout)
> > 2) Store that code into the remote.
> > 3) transmit that code back to the stamp receiving it via photo
>transistor
> > or 40 KHz receiver
> > 4) based on the code received activate relays.
> >
> > Thanks to all that can help,
> >
> > Rgards,
> >
> >
> >
> > Gary Denison II
> > Qualcomm Inc.
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>Yahoo! Groups Links
>
>
>
>
[noparse][[/noparse]Non-text portions of this message have been removed]
I am trying to write a program for a sound project, and having a bit of trouble.
I want
to write a program that, when a button is pushed, sends an infrared signal from
an IR
led to an IR detector. When the IR detector receives the signal, it should make
a
speaker emit a tone.
The circuit that I built has a speaker output from pin 7, an IR detector input
at pin 6,
an IR led at pin 9, and a button input at pin 15.
Any help would be much appreciated.
-L
Most IR systems, such as TV remote controls, are modulated. This meas that
the IR beam is pulsed, in the case of a TV remote, usually at 38kHz. This
helps prevent ambient light triggering the reciver, as they are tuned to
38kHz. It is very easy to use a 38kHz reciver with a Stamp. A little harder
is to transmit with the Stamp, as it does not have independent PWM to drive
the 38kHz carrier. You can use a 555 timer or similar to create the carrier
signal and a Schmitt trigger NAND like the 74HC132.
Bruce at Rentron has a good explanation of IR communications here:
http://www.rentron.com/Infrared_Communication.htm
While the page is about using PICs to accomplish the task, it has a lot of
general information about IR communications. I also have information about
an IR reciever module on my website at: http://madlabs.info/ir_remote.shtml
. It would be simple to convert the code for this module for a Stamp.
Hope this helps,
Jonathan
www.madlabs.info
Original Message
From: "elevenroyalst" <elevenroyalst@y...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, April 18, 2004 10:42 AM
Subject: [noparse][[/noparse]basicstamps] infrared help
> hello,
>
> I am trying to write a program for a sound project, and having a bit of
trouble. I want
> to write a program that, when a button is pushed, sends an infrared signal
from an IR
> led to an IR detector. When the IR detector receives the signal, it should
make a
> speaker emit a tone.
>
> The circuit that I built has a speaker output from pin 7, an IR detector
input at pin 6,
> an IR led at pin 9, and a button input at pin 15.
>
> Any help would be much appreciated.
>
> -L
>
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed. Text in the Subject and
Body of the message will be ignored.
>
> Yahoo! Groups Links
>
>
>
>
>
>