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FreeTrack Forum > FreeTrack : English Forum > Support : Tracking System > [Help] building 3Point Free Track Cap

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kinas #1 11/11/2012 - 13h44

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Hello Guys,
i want to build 3Point Free Track Cap but i need your help for buying matterials.
So i found some IR-Leds. Is these Leds good for Free Track Cap? What Leds are better?
Ebay: 1.

http://www.ebay.com/itm/10-Stuck-IR-LED-Infrarotdioden-Sendedioden-TSAL4400-/280647227324?pt=Bauteile&hash=item4157e0d7bc


Or maybe its better these:
2.

http://www.ebay.de/itm/10x-IR-LED-Infrarotdiode-SFH-487-2-/110968667272?pt=Bauteile&hash=item19d63f7c88


What about Resistors? What Resistors sould i need if i take these Ir-Leds ^^?
And last pount: Batteries.. Is enough 2-Batterieholder?

(Sorry for my bad english)
Thankyou for these answers
With Regards,
Edited by kinas on 11/11/2012 at 14h07.
Steph #2 12/11/2012 - 11h04

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Hi,

both are Ø3mm. So I do not recommend them.
You better go for the Ø5mm like the SFH485P.

If you are in Germany:

Conrad: SFH485P
or
Farnel: SFH485P

The resistor depends on your batteries supply, 3V, 4.5, 9V... or what ever.
But they do not last very long. I recommend 5V USB charger power supply.
kinas #3 12/11/2012 - 18h15

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Steph @ 12/11/2012 - 11h04 a dit:

Hi,

both are Ø3mm. So I do not recommend them.
You better go for the Ø5mm like the SFH485P.

If you are in Germany:

Conrad: SFH485P
or
Farnel: SFH485P

The resistor depends on your batteries supply, 3V, 4.5, 9V... or what ever.
But they do not last very long. I recommend 5V USB charger power supply.




Oh thank you.. :) But if these IR-LED's has got 3V so i can take 9V Battery.
But if i take 9V Battery it is ok when i take 30Ohm Resistor?
Edited by kinas on 12/11/2012 at 18h36.
Steph #4 13/11/2012 - 13h19

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No, forward voltage of the SFH485P is 1.5V.
So for a serial circuit with 80mA:

9V - (3 x 1.5V) / 0.08A = 56 Ohm
and
56Ohm x 0.08A² = 0.358W

you need a 56 Ohm resistor with 1/2W Power rating.

or go for this build:
http://forum.free-track.net/index.php?showtopic=1856&message=11461

But again, with 80mA and  2000mAh batteries you're lifetime is about 10-12h.
Not really economic.
Edited by Steph on 13/11/2012 at 13h31.
kinas #5 13/11/2012 - 20h05

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Yeah i think with Usb-Power Suply is better but i want to build this in low buged and I have not so much money.. :(
Is the lifetime 10-12h for Resistors or LED'S?
Steph #6 13/11/2012 - 20h45

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It's the livetime of your batterie. ;D

A USB-Charger do not cost the earth:

USB-Ladegerät

If you got any other power supply 5V,6V,9V... you can take them either. (Old mobile charger, or what ever. Mobile charger (Handy-Ladegeräte) are good because they are regulated.
Ask if you got problems with resistor calculation.
kinas #7 14/11/2012 - 16h10

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Steph @ 13/11/2012 - 20h45 a dit:

It's the livetime of your batterie. ;D



I have no Idea about the Lifetimes-Resistors... :D
doveman #8 17/11/2012 - 21h58

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I found that the USB PSU adapter I have says it's 4.4v, not 5v. I didn't really like using the USB cable to power the LEDs anyway, as it's quite thick and heavy.

I've got a proper 5v PSU spare, which is this one http://newpowercord.com/index.php?main_p...ts_id=5107 which would be better as the lead is quite thin and light.

I want to get a inline DC power socket to attach to my clip, so that I can plug the PSU into it. What size DC power socket will I need? It says "Pin Size: 0.9 x 3.5 x 7.7 mm" so I guess I need 3.5mm by 0.9 but I'm not sure if I can buy that. The most common one on ebay seems to be 1.2 or 1.3mm.
kinas #9 08/12/2012 - 16h56

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after pause want to continue my build
i have now all battery holder 2XAA and 3 IR leds just no Resistors :D
i think this Resistors are good:
http://www.ebay.de/itm/100-Kohleschichtwiderstande-30-Ohm-0-25-W-5-/160929530241?pt=Bauteile&hash=item257825c181
or its maybe this one better?:
http://www.ebay.de/itm/100-x-30-Ohm-0-25w-Carbon-Resistors-1-4w-Resistor-30R-/350333275092?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item51917d8bd4
Edited by kinas on 08/12/2012 at 17h09.

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