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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > which one is better? the cap or the clip?

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zundap	#1 21/01/2008 - 17h26 Top
Class : Apprenti Posts : 14 Registered on : 21/01/2008 Off line	hi all, i just bought a new logitec quickcam express with the vendor id of 092F ( wich i think it is fully compatible now i will buy the leds, but i cannot find them near me ... my local shop only has 2 kinds: "cqy99" and the "ld271" here is what i could find in google CQY99 λp= 950[nm] IF=150[mA] Angle±50[°] transparent blue LD271 λp= 950[nm] IF=130[mA] Angle±25[°] transparent blue some say that the CQY99 has a 30º angle other say 50º ... what forward current should i use ? 1.4 ( optimal ) or 1.7 maximum? and current? 100mA ( optimal ) or 150mA maximum? is it possible to make a 3 point tracking system with these IR leds? im thinking about buying a chinese power supply ( 6v 500mA ) to connect them. basically im asking if this will work: > logitec quickcam express ( 092F ) > 3x IR led "cqy99" or "ld271" > 1x 35ohms resistor ----> for 3 leds @ 1.4v 100mA ( 6v ) > 1x power adapter 6v 500mA ( chinese ) i will mod the camera to remove the IR filter and apply the disk filter. thank you for all your help! Edited by zundap on 23/01/2008 at 23h24.
tristan68	#2 22/01/2008 - 09h47 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello Zundap. 1) logitec quickcam express ( 092F ) 3x IR led "cqy99" or "ld271" 1x 35ohms resistor ----> for 3 leds @ 1.4v 100mA ( 6v ) 1x power adapter 6v 500mA ( chinese ) Your values are Ok , according to the provided parameters. Maybe you'll have to sand your leds, to increase angle. You'll have to try and see. 2) hints : If using an IR modded webcam , you usually don't need to use your leds at full power. 50 mA should be more than enough to get a correct result (I personnally use only about 20mA to 25mA in my setups, with IR modded webcam). If you want to stick to your 100mA value, make sure to get a resistor which can handle the dissipated power (0.36W, so you'll have to get a 1W , since a 0.5W will still get hot when in use). cya
zundap	#3 22/01/2008 - 15h21 Top
Class : Apprenti Posts : 14 Registered on : 21/01/2008 Off line	thank you very much for your reply ! i checked at farnell to see if they sell to me and i could manage to order the recomended SFH485-P leds this friday i should have them to mount the 3 dot cap. here is what im also buying: logitec quickcam express ( 092F ) ------------------------- 30fps as stated 3x IR led - SFH485-P 1x 47ohms resistor ----> for 3 leds @ 1.5v 70mA ( 6v ) 1x power adapter 6v 500mA ( chinese ) my only doubts now are: i have a wiimote at home and i heard that this wonderful piece of software will probably support it so here are my options: 1- mod the camera and put the leds at 20-25mA 2- give back the camera ( still have 15 days ) and wait for the wiimote support. 3-do not mod the camera and put the leds at 70mA with a photo film filter what would you do if you were in my place ? thank you very much for your support!
tristan68	#4 22/01/2008 - 17h08 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	mmmmhhhh I would personally : - keep the webcam unmodded, and run the leds at 70mA - use this setup until FT supports the wiimote. - once FT supports the wiimote : if wiimote works better AND you have a spare wiimote AND a spare BT dongle, then switch to wiimote. Otherwise, stick to standard webcam if ok , or IR mod the webcam at this time. cya
zundap	#5 22/01/2008 - 18h06 Top
Class : Apprenti Posts : 14 Registered on : 21/01/2008 Off line	well, since im not modding the camera ( waiting for wiimote ) ill use a logitech sphere that actually works better than the quickcam express, and i already own one. And I'm changing my configuration to this: 1x Quick Cam Orbit / Sphere MP ( PID 08C2) 3x IR led - SFH485-P 1x 7.5 ohms resistor ----> for 3 leds @ 1.5v 70mA ( 5v ) 1x cable USB 1x 0.2A Quick release fuse 1x camera film filter and 1 x 20ohm resistor ( to put the leds @ 25mA to use with the wiimote when it is suported ) guess there is no need to mod the camera when using the SFH485-P @ 70mA and the camera filters right? Is this setup safe? will it work? btw: wich one is better? 3 points clip or the 3 points cap? Edited by zundap on 22/01/2008 at 20h08.
tristan68	#6 23/01/2008 - 10h05 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello zundap 1x 7.5 ohms resistor ----> for 3 leds @ 1.5v 70mA ( 5v ) This resistor value is ok if you plan to power your leds using a 5v power source. 5V ??? do you finally get a 5v power adapter, or do you plan to use USB power ? If you use usb power, be careful not to fry your PC's motherboard. 1 x 20ohm resistor ( to put the leds @ 25mA to use with the wiimote when it is suported ) Correct guess there is no need to mod the camera when using the SFH485-P @ 70mA and the camera filters right? you shouldn't have to, but as usual, you'll have to try it out , since it depends of your webcam and room lighting conditions. btw: wich one is better? 3 points clip or the 3 points cap? Better ? Dunno, sorry. Kestrel has the answer to such questions, i'm sure he'll drop a line here very soon cya
zundap	#7 23/01/2008 - 10h41 Top
Class : Apprenti Posts : 14 Registered on : 21/01/2008 Off line	thank you very much for your reply tristan68! i decided to use the USB to power the leds, and i'll be using a "0.2A Quick release fuse" so i dont fry my motherboard ( hope it protects it ). now ill have to find out which is better , the clip or the cap Edited by zundap on 23/01/2008 at 23h25.

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > which one is better? the cap or the clip?

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