> Resistors for TV remote controller like IR leds
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dmxgordon |
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Class : Apprenti
Posts : 25
Registered on : 22/12/2011
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Hello! I need your help guys in creating a tracking system, so...
1. What is the best tracking system? With 3 or 4 leds?
2. I'm planning to power the system from an USB port so what resistors should I use? I whent at an electronics-shop and talk about my "project". The guy from there gave me 3 IR Leds normaly used at TV remote controllers (3 Volts LEDs) and 3 resistors with 5 band collors (brown, black, black, brown, brown....i thing those are 1K ohm resistors, I'm not shore). He told me to connect the leds in parralel, using those 3 resistors. I'm afraid of doing it wrong so i need your help, is it correct what that guy told me?
Here is a lame foto with one of the resistors, foto taken by me with my lame phone:
http://imageshack.us/photo/my-images/822/img00226x.jpg/ |
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Steph |
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Class : Moderator
Posts : 656
Registered on : 16/11/2007
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Hi,
1. Three LEDS is better.
2. You need the datasheet for the LEDS to determine the right resistors.
I don't see anything on this photo 
Looks more then a 10 Ohm which makes more sense. Better photo possible?
I'm planning to power the system from an USB port
Better use a USB Power adapter, if you don't know exactly how to do, you can damage your motherbord.
Have a look here Post #24. With USB power adapter you don't need the PTC fuse.
Serial circuit is better in this case. |
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dmxgordon |
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Class : Apprenti
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Registered on : 22/12/2011
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Hi there, and thank you for helping me.
Nope, i cannot take a better picture:( but the color code on those resistors is: brown, black, black, brown, brown. I think it means 1Kohm resisror right?
Don't have datasheet eather:( but those are regular 3 Volt IR Led, commonly used for TV remotes. I gues that those are using 100 mA.
I do not have the posibility of buying SFH485p LEDs so i need to use what IR LEDs i allready have.
So, can someone show me a scheme so i can buil a circuit with the IR LEDs that i have? Maybe i can use those resistors too???
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Steph |
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Class : Moderator
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Registered on : 16/11/2007
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Nope, i cannot take a better picture:( but the color code on those resistors is: brown, black, black, brown, brown. I think it means 1Kohm resisror right?
Depends from what side you read. I can't see anything. 
Try this one:
Resistor color code calculator
So, can someone show me a scheme so i can buil a circuit
Have a look here Post #24.
Then use the LED assembly wizard.
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dmxgordon |
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Class : Apprenti
Posts : 25
Registered on : 22/12/2011
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I'm really confused now. What is the right side for reading the resistor?
This is a paint reprezentation of that photo:
http://imageshack.us/photo/my-images/683/89615384.jpg/
Can someone teach me how to create a circuit using the 3 Volts IR LEDs please? |
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benmeijer |
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Class : Habitué
Posts : 208
Registered on : 19/07/2008
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Use the 5 band / blue resistor for reading the values.
Brown - Black - Black x Brown - Brown = 1 - 0 - 0 x 10 - (1%) = 1000 Ohm = 1 kOhm
or
Brown - Brown - Black x Black - Brown = 1 - 1- 0 x 1 - (1%) = 110 Ohm
If you use 3x 110 Ohm (parallel) ===> 37 Ohm
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dmxgordon |
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Class : Apprenti
Posts : 25
Registered on : 22/12/2011
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Benmeijer, the picture you just posted is exactly the same as my resistors. I've searched the web and find that mine's are 110 Ohm resistors, not 1 kOhm.
So, if I'm using 3 Volt IR LEDs and 110Ohm resistors conected in paralel (3 LEDs and 3 resistors), supplied from a 5 Volt source (regular USB) will it all work?
This is the circuit i'm talking about:
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benmeijer |
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In your diagram (showing SFH485p) the long leg is minus. Probably the leds you are using the long leg is positive!
In general the leg on the flat side of the led always is minus.
I think you should lower the values of the resistor. But try one led and resistor and use your camera to check if it lights up enough.
2 x 110 ohm parallel = 55 ohm
3 x 110 ohm parallel = 37 ohm
etc.
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dmxgordon |
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Class : Apprenti
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Registered on : 22/12/2011
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Cool ideea from the picture that you post, but after connecting resistors like that, how do you connect 3 leds? In series or parallel?
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benmeijer |
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Use your own diagram, in the place where you have 1 resistor of 110 ohm, you could use 2 (or 3) to lower the resistance to 55 (or 37) ohm.
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dmxgordon |
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Class : Apprenti
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Registered on : 22/12/2011
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Oh, I get it! Thank you for help.
Thank you all for helping, I'll be back with a feedback in a few days.
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dmxgordon |
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Class : Apprenti
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Registered on : 22/12/2011
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I dit it, my led system is complete!
But after finding that my webcam is not compatible, i've tryed Slipcam.
Te Slipcam is correctly setuped but still, in Freetrack all i see is a black window, no signal from the source called: Slipcam Video Capture
Can someno hel me please?
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dmxgordon |
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Class : Apprenti
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Registered on : 22/12/2011
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Nevermind, i bought a new camera called Gembird CAM66U.
The thing is that i don't know how to disable autoexposure. I only get 8 FPS in FreeTrack.
Can someone help me please?
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Steph |
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Posts : 656
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Edited by Steph on 10/01/2012 at 14h12. |
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dmxgordon |
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Class : Apprenti
Posts : 25
Registered on : 22/12/2011
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Sorry, I'm trying to resolve this issue.
I have no use for Vistaenabler, look here:
so...what sould i do? |
