1: Using a USB cord as your power source only provides 5v of power. If you need 3 LEDs running at 3v per, how do you power them? Is it acceptable or even possible to use lower voltage LEDs?
In this case you would wire the LED's in parallel and use a resistor over each LED to drop the voltage to 3v.
2: relating to question 1, will i need a resistor if my 5v of power are not exact to what the LEDs use? ie: 5v USB powering 3 1v LEDs. (2 volts remaining) will that over power and blow the LEDs?
Mine just shut off when I applied an overvoltage but yeah you have to get the voltage right or you'll have troubles. The Freetrack website has a calculator.
You plug in the values of your LED's and get a wiring diagram with resistor specs and even a resistor picture chart.
3: When wiring, Ive red the Red wire in USB is the hot (positive) and the Black is the neutral (ground) and the other shouldn't be needed. Is this accurate?
Pin Name Cable color Description
1 VCC Red +5 VDC
2 D- White Data -
3 D+ Green Data +
4 GND Black Ground
Yup, red is pos, black neg and you don't need the other two. Probably best to isolate them, dunno what would happen if they shorted out.
And USE SHRINK TUBING, not electrical tape. These wires are too small for tape.
LED's are polarity sensitive, they have a pos and a neg. Wire them properly.
Btw: I read the default IR LED (OSRAM SFH485P) take 3volts to power. Im assuming that is the standard. Right?
I used a different one on the very bottom of this page
http://www.mainelectronics.com/KLInfraredEmitLED.htm
The important thing is the viewing angle, determines how far you can turn your head before your camera looses the signal.
160 deg should be enough. The OSRAM ones above will work fine but you have to wire in parallel as per the Freetrack website.
Parallel wiring has advantages - if one LED burns out you'll know right away because one won't work. Easy for anyone to troubleshoot.
If you use 1.5v LED's and wire in series with a resistor if any one component fails the whole thing will just stop without a clue if it's the power supply or an LED or the resistor or even the USB hub inside the computer.
Or (like Trout) a wire that overstressed and just broke.
A lot more steps to track down the problem.
Had a chat with Pappy last night on TS and gave him part numbers and some tips to get started.
Shopping list:
LED's
resistor(s)
thin solder
shrink tubing
Camera?