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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > question about led distance

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saied	#1 25/12/2008 - 03h52 Top
Class : Apprenti Posts : 18 Registered on : 06/10/2008 Off line	hello. this is an awesome forum. i have a question and im wondering how i can use u guys use the calculator on this website to find the distance and led. i really appreciate if someone could point me to the right direction. also does the distance matter between each LEDs or not. i be very greateful if someone could help. thank you and god bless
didja	#2 25/12/2008 - 20h43 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	Hello saied Have a look in the Hardware FAQ, you'll find what you're looking for : http://forum.free-track.net/index.php?showtopic=413 If you have software problems, try also the software FAQ : http://forum.free-track.net/index.php?showtopic=455 Rémy
saied	#3 25/12/2008 - 21h39 Top
Class : Apprenti Posts : 18 Registered on : 06/10/2008 Off line	didja u are very helpful. thank you very much. can i ask if i can use IR leds with watch batteries to power the Leds cause i dont understand these resistor things. also is a joystick needed to use freetrack with fs. ill be using a wii mote to track. thanks didja and everyone else. best forum ever and i appreciate ur help
didja	#4 25/12/2008 - 21h52 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	I don't think watch batteries are powerful enough... Don't worry, it's really easy to get a system working... - 2 batteries 1.5v - 3 leds Once you know which leds you have, use the calculator on the website to know which resistors to buy and that's it . Rémy
saied	#5 25/12/2008 - 23h07 Top
Class : Apprenti Posts : 18 Registered on : 06/10/2008 Off line	thanks didja. how about these http://www.cheapbatteries.com/coin.htm they are coin sized batteries and i saw a video on youtube which some guy make led throwies out of them. if i use the aa batteries how do i find out the info to put it on the calculator cause idk where that info is
didja	#6 25/12/2008 - 23h16 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	I don't really know about those batteries but I've never heard of someone using one of these. If uou use 2 1.5v batteries, you put 3 V in the calculator. When you choose your leds, you look (or ask) for forward continuous current (usually between 20 and 100 mA) and for the forward voltage (usually 1.5V), then you've got all you need for the calculator. Rémy
saied	#7 26/12/2008 - 05h52 Top
Class : Apprenti Posts : 18 Registered on : 06/10/2008 Off line	alright here is the LED i found at radioshack. http://www.radioshack.com/product/index.jsp?productId=2062565&tab=features it tells u the forward voltage but not the continuous current. also for the video with the LEDs throwies http://www.youtube.com/watch?v=YjTP_T-wR9w thanks didja. appreciate it. if i can get this thing to be made by next week it would be awesome
didja	#8 26/12/2008 - 19h05 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	Hi again, I'm sorry, this IR led is not suitable for a FreeTrack use... The peak wavelenght is 940nm... We need around 880nm for FreeTrack... I've been exploring this website but couldn't find a good IR led on it... If you really want to buy on this website, go for this one (http://www.radioshack.com/product/index.jsp?productId=2102849 ) because it's wide angle... Unfortunately, it's not IR... If you search on other websites, try to fin the SFH485P IR led, it's the best one for FreeTrack ! Rémy
SixIron	#9 30/12/2008 - 00h03 Top
Class : Apprenti Posts : 5 Registered on : 20/12/2008 Off line	I use those Radio Shack LED's and they work just fine. Flatened the tops with 220 grit sandpaper and run on a MS VX3000 web cam without modification. Those LED's are rated 1.2v, 100ma, 45 degree viewing angle
didja	#10 01/01/2009 - 22h10 Top
Class : Webmaster (admin) Posts : 1043 Registered on : 09/07/2007 Off line Www	Wich one, the IR led with a 940nm wavelength ? The problem with those leds is that sometimes, the wavelength can't get through the IR filter or the webcam just can't see this range of infrared light. But with some webcams, it'll work fine, but that's why we usually unrecommend it. Rémy
SixIron	#11 07/01/2009 - 18h44 Top
Class : Apprenti Posts : 5 Registered on : 20/12/2008 Off line	Correct. RadioShack #276-0143 Hi-output 5mm I/R LED 1.2v, 100ma, 45degree, 940nm Works fine for me with a unmoded MS VX3000 web cam.
Dadio	#12 12/06/2009 - 19h28 Top
Class : Apprenti Posts : 1 Registered on : 24/02/2009 Off line	I can confirm same ascertion above that these Radio Shak IR LEDs work fine with my setup. 3 point clip 3 RadioShak IR LEDS Sanded flat to allow wider viewing angle 9 volt battery, with resistors as calculated by your FreeTrack model calculator MS vs3000 web-cam, with IR filters removed Visible Light filter applied (made from floppy disk) in place. This setup really works pretty darn well! Kudos to all you who built and work on FreeTrack. Its really pretty amazing stuff! I started this as an 'experiment' to see if I could get it to viably work, and it sure does! For about $20 investment in parts. The only time I have any trouble is when my battery power runs low and the LED's output wanes. At this point its prone to stutters and the cam just isn't picking up enough IR radiation from the LEDS. Solution, replace/recharge battery. Otherwise, though I'm having great luck with this.!

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > question about led distance

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