Re: [PD] OT: Ir leds
> Date: Sun, 29 Aug 2010 19:44:16 -0700 > From: ronni montoya > > Im making an interactive floor and i need to iluminate a space of 4 x > 4 meters with ir light. Hi Ronni, this question would be best asked on the openFrameworks forum http://openframeworks.cc/forum since many people there work professionally with computer vision and related interactive technology on a day-to-day basis... hth d -- damian stewart . @damiannz . dam...@frey.co.nz frey . contemporary art . http://www.frey.co.nz ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Re: [PD] OT: Ir leds
only 18 leds? wow , can you tell me please which large was the space you iluminated? how many meters does it have? A circle of approximately diameter 2 meter. The 18 LEDs are placed at a distance of approximately 1 to 2 meters. http://gerard.paresys.free.fr/Installation/index.html Gerard thanks!!! 2010/8/30 Gerard Paresys : I illuminated an installation with 18 IR diodes OPE5685. http://radiospares-fr.rs-online.com/web/4550802.html For an Unibrain camera ref 2061: http://www.unibrain.com/Products/VisionImg/Fire_i_BC_remoteCCD.htm with 2.1mm Wide Lens (no IR coating) Gerard ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Re: [PD] OT: Ir leds
I illuminated an installation with 18 IR diodes OPE5685. http://radiospares-fr.rs-online.com/web/4550802.html For an Unibrain camera ref 2061: http://www.unibrain.com/Products/VisionImg/Fire_i_BC_remoteCCD.htm with 2.1mm Wide Lens (no IR coating) Gerard ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
Re: [PD] OT: Ir leds
You probably want the brightest ones (usually measured in in mcd) you can get! Besides that, if you know anything about the camera you are using that would help a lot, for example which part of the spectrum in nanometers it is most sensitive to. Then you can match it to the spectrum emitted by the LEDs. Another characteristic is the angle of the LED, in your case you probably want them to be pretty wide. Some LEDs are low current or ultrabright, which mean they are better at making light from current. Ultrabrights, however use a ton of current at their brightest. This is usually only a concern if you are running from a battery or very weak power supply (or in something like a voltage controlled synthesizer when a sudden big current draw can have audible consequences!). So once you understand the characteristics of the LEDs, you can choose the ones for your budget. You'll still have to do a lot of testing to get the right amount of light for the space and your camera. It's always of a question of whether you have more money than time, or time than money. Somehow I seem to have neither these days, I wonder what I'm doing wrong! ;-) Best, Derek On 8/30/10 4:44 AM, ronni montoya wrote: Hello everybody, i dont know if here is the correct place to ask, if anybody know another forum related to this , i will be very happy if somebody can show me: Im making an interactive floor and i need to iluminate a space of 4 x 4 meters with ir light. I been seen there are some ir leds matrix on survillance stores but they are expensive to my budget, so i was thinking that i can build my own ir led matrix . I been seen there are tons of different types of ir leds with different characteristics. Do anybody know which ir leds do i need for this? which model, label or serial number? Any idea would be appreaciated thank you very much Ronny ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list -- ::: derek holzer ::: http://macumbista.net ::: ---Oblique Strategy # 183: "When is it for?" ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
[PD] OT: Ir leds
Hello everybody, i dont know if here is the correct place to ask, if anybody know another forum related to this , i will be very happy if somebody can show me: Im making an interactive floor and i need to iluminate a space of 4 x 4 meters with ir light. I been seen there are some ir leds matrix on survillance stores but they are expensive to my budget, so i was thinking that i can build my own ir led matrix . I been seen there are tons of different types of ir leds with different characteristics. Do anybody know which ir leds do i need for this? which model, label or serial number? Any idea would be appreaciated thank you very much Ronny ___ Pd-list@iem.at mailing list UNSUBSCRIBE and account-management -> http://lists.puredata.info/listinfo/pd-list
