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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Need help, LED assembly wizard.

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Hopdevil84	#1 28/04/2011 - 21h20 Top
Class : Apprenti Posts : 6 Registered on : 06/04/2010 Off line	Hello. I have following components: MS VX-1000 webcam (brand new) 6x OPTO L53SF4BT (IR) 3x 61 ohm (1%tolerance), no idea why I got those because I'm still not sure what source to use. Maybe I read colors wrong too. blue-brown-white-gold - brown. I understand I need 3 leds and 1 resistor but I got more in case something goes wrong. I'm still trying to figure which resistor I need to use. I don't know which values to input in LED Assembly wizard. I understand if I pick USB source that power supply value would be 5V, however I cannot figure forward voltage and forward current of those LEDS. I would love to hear some opinions on those leds. Will those be fine for my setup? It is IR led and it is 5mm, thats pretty much all I know about it. One more problem would be how to realize that power through usb, I tried to find some good tutorials but with no luck. Maybe I should pick something else as source but I don't like the idea of switching batteries all the time. I would really appreciate some help
dewey1	#2 28/04/2011 - 23h09 Top
Class : Habitué Posts : 191 Registered on : 25/06/2010 Off line	OPTO L53SF4BT: 1.3 V typical at 20mA. Absolute max 50mA at 25 deg C. 1.3 x 3 = 3.9V if series circuit. Assume 5V if USB powered. 5V-3.9V=1.1V drop. Use 30 mA current. R= 1.1/.03 = 36.7 ohm. Use a 33 ohm which will be 33mA.
benmeijer	#3 29/04/2011 - 07h57 Top
Class : Habitué Posts : 208 Registered on : 19/07/2008 Off line	Hopdevil84 @ 28/04/2011 - 23h20 a dit: 3x 61 ohm (1%tolerance), no idea why I got those because I'm still not sure what source to use. Maybe I read colors wrong too. blue-brown-white-gold - brown. One more problem would be how to realize that power through usb, I tried to find some good tutorials but with no luck. Maybe I should pick something else as source but I don't like the idea of switching batteries all the time. I would really appreciate some help About reading the colors of the resistors, see picture (blue resistor / 5 rings) blue - brown - white - gold - brown = 6 - 1 - 9 - 0.1 - 1% = 619 * 0.1 = 61,9 ohm with 1% tolerance Use 2 resistors (61.9 ohm) parallel to get 31 ohm, what Dewey suggest for about 33mA or 3 to use the max current (50 mA) of your leds about power from your PC: Use USB cable (Gnd and 5v / Black and Red wires) or use PSU from your PC have perfect 5V. see picture .... (use Black and Red) An other alternative is to use 5V from a keyboard PS2 plug (use pin 3 and 4) if you use an USB keyboard. Edited by benmeijer on 29/04/2011 at 08h03.
Hopdevil84	#4 03/05/2011 - 15h55 Top
Class : Apprenti Posts : 6 Registered on : 06/04/2010 Off line	This might sound stupid but I'm not sure what kind of wire I need to connect those leds and resistors I've read somewhere that you can use UTP cable... it has 8 wires inside... edit: I appreciate help but I've changed my mind. Without very detailed guide how to use USB I wouldn't try it at all, don't want to dmg usb port or worse, motherboard. I decided to go for batteries for start, what kind of batteries do I need. Big one? 9v? Edited by Hopdevil84 on 05/05/2011 at 10h20.
Hopdevil84	#5 06/05/2011 - 17h28 Top
Class : Apprenti Posts : 6 Registered on : 06/04/2010 Off line	Ok this is starting to become really frustrating experience. I decided to go for 9V block battery as a source to avoid any possible damage. So I visited local shop to get new resistor(s). I asked for 180 Ohm 1/4 W 5% resistor, (as wizard suggested if all values are right). Uploaded with ImageShack.us They said they didn't have it but gave me the one that was "supposed" to be 200 Ohm or something. When I got home and read the color code it was clear it is 820 Ohm resistor So what are my options now? The closest REAL good shop is like 200km away from this place. I could order online probably but it would be expensive shipping... much more expensive than the product anway. I suppose 61.9 nad 820 ohm are no use to me if I use 9v battery. Should I go for USB power after all and use 2x 61.9 in parallel? Edited by Hopdevil84 on 06/05/2011 at 17h29.
dewey1	#6 06/05/2011 - 19h42 Top
Class : Habitué Posts : 191 Registered on : 25/06/2010 Off line	You have 3 of the 61.9 ohm resistors. Three in series is 185.7 ohm, This will work if you use 9 volt. 9-3.9=5.1 5.1/185.7=.027=27mA.
Hopdevil84	#7 07/05/2011 - 10h16 Top
Class : Apprenti Posts : 6 Registered on : 06/04/2010 Off line	thanks a lot dewey I can confirm LEDs are shining bright, shame my cap point model is pretty bad, I will probably have to make new. Or even clip, that looks kinda better to keep leds centered and in line. Edited by Hopdevil84 on 07/05/2011 at 17h43.

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > Need help, LED assembly wizard.

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