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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > LED Assembly Wizard??

RSS > LED Assembly Wizard??, Is it bugged?

Niek	#1 25/03/2008 - 01h17 Top
Class : Apprenti Posts : 11 Registered on : 24/03/2008 Off line	Hi! I'm ordering some parts to build me a 3-point clip with SFH485P's. They need 1,5V and 100mA. I will power them with USB (with a PTC-fuse, 0,2A trip), so output is 5V. The leds are in series so when I want to calculate the resistor I get: 5V - 3x 1,5V = 0,5V over resistor. R=U/I => 0,5V/0,1A = 5 Ohm resistor When I calculate the same with the LED assembly wizard on this website it says I need a 20 Ohm resistor! What's going on? Edited by Niek on 25/03/2008 at 01h31.
larockonoli	#2 25/03/2008 - 05h26 Top
Class : Apprenti Posts : 10 Registered on : 10/03/2008 Off line	let me know if you get your setup running... I am thinking about running off a USB as well, but I have no clue on the fuse size, etc. so I would rather make sure someone has success on it first.
tristan68	#3 25/03/2008 - 11h16 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello Niek I just checked the wizard. For your settings : - 5v USB power - 3 x SFH485P - 1.5v led voltage drop - 100 mA the wizard suggests the following, which IMO is OK : Can you please confirm the values you entered ?? BTW : - The wizard doesn't take account of the PTC voltage drop. You have to see for that. Next version will implement it. - You shouldn't power your SFH485P's at 100mA, it's the max value when led is PCB mounted. For cable mount, the max suggested value is about 75mA. Cya
George	#4 25/03/2008 - 12h27 Top
Class : Apprenti Posts : 2 Registered on : 25/03/2008 Off line	Hi Niek, you typed 1,5 instead 1.5 I made the same before...
Niek	#5 25/03/2008 - 18h38 Top
Class : Apprenti Posts : 11 Registered on : 24/03/2008 Off line	George @ 25/03/2008 - 12h27 a dit: Hi Niek, you typed 1,5 instead 1.5 I made the same before... Haha, that's it! And thanks for the tip about the 75 mA and PTC voltage drop! I'll check it out! I already ordered some female mini usb connectors to connect the usb cable to my future device. Edited by Niek on 25/03/2008 at 18h41.
tristan68	#6 26/03/2008 - 19h54 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello niek. NP , and good luck for your setup cya
Syquus	#7 19/01/2009 - 16h42 Top
Class : Apprenti Posts : 23 Registered on : 18/01/2009 Off line	Does the LED Assembly Wizard online work? I'm trying to use it, filling with my info, but it doesn't give any responses. Tried with FF and IE Regards
Syquus	#8 19/01/2009 - 17h13 Top
Class : Apprenti Posts : 23 Registered on : 18/01/2009 Off line	I'm sorry for my last posts. It's working perfectly. I was introducing wrong values. (out of range for programmed webpage)
kookookalvy	#9 23/01/2009 - 18h53 Top
Class : Apprenti Posts : 1 Registered on : 19/01/2009 Off line	tristan68 @ 25/03/2008 - 11h16 a dit: Hello Niek I just checked the wizard. For your settings : - 5v USB power - 3 x SFH485P - 1.5v led voltage drop - 100 mA the wizard suggests the following, which IMO is OK : Can you please confirm the values you entered ?? BTW : - The wizard doesn't take account of the PTC voltage drop. You have to see for that. Next version will implement it. - You shouldn't power your SFH485P's at 100mA, it's the max value when led is PCB mounted. For cable mount, the max suggested value is about 75mA. Cya Hey, I've never responded on a forum before. I used a 33ohm resistor for mine (and my buddies) You are trying to cut down output amps from 100mA to about 20mA I think, Mine ends up at 45mA with calculator thing. No problems with the USB, (so far) I guess if it were gonna fry my Motherboard it would have already. (I hope) I tried to donate too, but what a pain.
tristan68	#10 23/01/2009 - 23h06 Top
Class : Electronicien en chef Posts : 651 Registered on : 10/07/2007 Off line	Hello kookookalvy can you tell me what params you used ? thanks. cya

FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > LED Assembly Wizard??

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