DIY Infra-red ? - Page 12 - RC Groups
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Feb 24, 2003, 08:15 PM
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Koichi Tanaka's Avatar
Dario,

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

Regards,
Koichi
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Feb 25, 2003, 07:11 PM
Registered User
jberg's Avatar
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
Last edited by jberg; Feb 25, 2003 at 07:13 PM.
Feb 25, 2003, 07:20 PM
Registered User
jberg's Avatar
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
Feb 26, 2003, 03:50 PM
Was that my 15 minutes?
Andy Birkett's Avatar
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
Feb 27, 2003, 08:49 PM
Registered User
Koichi Tanaka's Avatar
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.
Feb 28, 2003, 02:02 PM
Sticky Shepherd
Graham Stabler's Avatar

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
Feb 28, 2003, 03:24 PM
Registered User
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
Feb 28, 2003, 03:29 PM
Nickel what?
Phreakish's Avatar
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?
Feb 28, 2003, 03:54 PM
Registered User
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 TXs. 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
Feb 28, 2003, 03:59 PM
Nickel what?
Phreakish's Avatar
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...
Mar 08, 2003, 07:35 PM
Registered User
could this be useful? 4 x 8 array for $7...
http://www.mcmelectronics.com/Home/l...75&SKUID=16220
Mar 09, 2003, 05:17 AM
Thats NOT indestructible
j8m8l's Avatar
That array might actually be quite good.

Good value too !!

Josh
Mar 09, 2003, 04:00 PM
Registered User
jberg's Avatar

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
Mar 10, 2003, 04:46 PM
Was that my 15 minutes?
Andy Birkett's Avatar
Wow, I have dificulty just flying one plane

If you want to borrow some webspace PM me.

Regards,
Andy
Mar 10, 2003, 05:41 PM
Registered User
jberg's Avatar
Andy,

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

Regards, Jochen