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Old Feb 24, 2003, 08:15 PM
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Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
Dario,

The receiver which can drive two actuators is under test now.

Regards,
Koichi
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Old Feb 25, 2003, 07:11 PM
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jberg's Avatar
MSC Rödinghausen, Germany
Joined Feb 2001
954 Posts
Hi all,

I've found a nice transparent plastic housing, made by Hammond in Canada and available from Conrad in Germany. The material is, according to the datasheet of the housing, quite translucent for infrared light. So I can put in my IR emitters without making holes, which looks nice.

For eye security I have also included four super-bright visible red LEDs which are so bright and flicker so much from the ~50Hz transmitter frame rate that you won't look at them for long. I think this prevents people from staring into the invisible infrared light.

Now I have to mount it to the Tx housing better than just by double sided sticky tape!

Regards, Jochen
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Last edited by jberg; Feb 25, 2003 at 07:13 PM.
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Old Feb 25, 2003, 07:20 PM
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jberg's Avatar
MSC Rödinghausen, Germany
Joined Feb 2001
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This is how my digital camera sees the light. The bright red LEDs are the visible ones. The weakly glowing blue ones are the IR emitters (up to now I have only put in four of them). Most video cameras and digital cameras are able to detect infrared light, which is good for testing.

You can see the word "Hammond" in the wall of the plastic housing.

Regards, Jochen
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Old Feb 26, 2003, 03:50 PM
Was that my 15 minutes?
Andy Birkett's Avatar
Leicester. UK
Joined Jan 2002
117 Posts
Nice packaging

May I suggest Velcro fastenings?

Having a visible source is also useful to remind yourself and others that an I/R transmitter is turned on

Regards,
Andy
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Old Feb 27, 2003, 08:49 PM
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Koichi Tanaka's Avatar
Japan
Joined Dec 2002
327 Posts
The luminescence state of my infrared transmitter was caught with the digital camera. It turns out that it has shone in the shape of radiation.
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Old Feb 28, 2003, 02:02 PM
Sticky Shepherd
Graham Stabler's Avatar
Oxford/England
Joined May 2001
4,017 Posts
Deleted post

Janne please feel free to start a thread advertising your system. This thread is for DIY from scratch so I have deleted the reply.

Cheers,

Graham
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Old Feb 28, 2003, 03:24 PM
Registered User
Oulu/Finland
Joined Jan 2003
22 Posts
Hi,

Sorry for that. Thought someone could be interested also about other DIY IR system...
BTW. Graham have you changed your email address?

Thanks,
janne
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Old Feb 28, 2003, 03:29 PM
Nickel what?
Phreakish's Avatar
Prescott, Arizona, United States
Joined Jan 2003
2,365 Posts
is IR light THAT bad for the eyes? I mean, my tv remote never bugs me I'm sure its not good, but does anyone know HOW bad it REALLY is?
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Old Feb 28, 2003, 03:54 PM
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Oulu/Finland
Joined Jan 2003
22 Posts
Hi,

Because the wavelenght is different from normal day light the eye does not react as normally for IR light. It could be harmful if the IR light is very powerfull as it is in IR TX´s. That is why we should never look directly to the emitters when the transmission is on. OK, it does not affect immediately but it might cause some problems after some time.. There are some documents about this issue in web.
What I have done is that I have installed high power white led next to the IR emitters so that it will protect the eyes. It is quite easy way to prevent problems...

-janne
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Old Feb 28, 2003, 03:59 PM
Nickel what?
Phreakish's Avatar
Prescott, Arizona, United States
Joined Jan 2003
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oic... yeah, I forgot that the eye doesn't contract when exposed to IR light... so it lets in too much light that can damage... I get it...
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Old Mar 08, 2003, 07:35 PM
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Berkeley, CA USA
Joined Apr 2001
643 Posts
could this be useful? 4 x 8 array for $7...
http://www.mcmelectronics.com/Home/l...75&SKUID=16220
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Old Mar 09, 2003, 05:17 AM
Thats NOT indestructible
j8m8l's Avatar
London UK
Joined Apr 2002
1,448 Posts
That array might actually be quite good.

Good value too !!

Josh
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Old Mar 09, 2003, 04:00 PM
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jberg's Avatar
MSC Rödinghausen, Germany
Joined Feb 2001
954 Posts
Good news: two IR channels!

Hi all,

today I've had a successful flight with two IR controlled planes at the same time. I have used Koichi's code to make two IR TX buddy boxes, one with the unchanged 38kHz carrier frequency and one with 56kHz carrier frequency. Everything else was basically left unchanged. Using a pair of Panasonic 38kHz IR sensors in one plane and a pair of 56kHz sensors in the second plane, another club member and I were able to control two models independently at the same time. We were flying in our ~45x25m gym. We did not notice any glitches regardless where we flew in the gym, near to the TXes or at the far end. We stood side by side at one end of the hall.

So this question that was open for some time is answered. At least two systems can work independently. I have taken a video but have to find some webspace first.

Regards, Jochen
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Old Mar 10, 2003, 04:46 PM
Was that my 15 minutes?
Andy Birkett's Avatar
Leicester. UK
Joined Jan 2002
117 Posts
Wow, I have dificulty just flying one plane

If you want to borrow some webspace PM me.

Regards,
Andy
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Old Mar 10, 2003, 05:41 PM
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jberg's Avatar
MSC Rödinghausen, Germany
Joined Feb 2001
954 Posts
Andy,

thanks, I will come back to this around Friday (I'm too busy at the moment).

Regards, Jochen
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