Hi, im using the arduino to turn on a relay and complete a curcuit connecting the USB to a curcuit like this one :
The IR's are TSHA203 , 100mA , Vr -5V, 180mW,
Now one thig i dont understand is how 5 * 0.1 = 0.5 W and not 0.18 W, so I assumed that it could work on lower values like 2 volts or 50 mA and these are the maximum ones.
...But i guess i was wrong couse the resistors are overheating.Can you guys point me in the right direction?
Thanks!
Having watched this YouTube Video in order to learn what a "freetrack helmet" is; I have a suggestion in the form of a question.
Why not use a single LED and 3 bundles of optical fiber(s)?
These LEDs: 5mm Blue Water Clear Ultra Bright that I buy from TaydaElectronics are rated as follows:
Forward Voltage(V): 3.2-3.4
// three AAA rechargables are 3.6 volts /.: still need a resistor to drop ~0.3 volts
Current(MA): 20
View angle: 20 degrees
Luminous intensity(MCD): 12,000 - 18,000
N.B. Dividing that into three fiber bundles and you still have point sources in the range of 3000+ mcd each.
If the camera being used can pick out the three points then that is what I will use when I build my Head Tracking unit using fiber bundles. Hmm, now where to find them for cheap? Has anyone done any experiments with something like a RiteAV Digital Optical Toslink Cable 6ft ($2.36each)to see what kind point source you can get out of one cut in half?
I MIGHT even hang the third point source from the chin strap just to be unique and assuming that the larger triangle produces increase in angular resolution. Probably will need to tell the software to flip the image upside down before processing OR write a modified driver. 
The Infrared LED 940nm 5mm TSAL7400
Specifications are:
Wave Length/Frequency: 940nm
Product Type: Infrared LED
Package: 5mm
A fairly typical "bright" IR LED will put out about 27 mW/sr, though they go up to 250 mW/sr or so. Source.
For comparison the Red Water Clear LEDs made by Lite-On are only 1800 mcd @20mA.
interesting idea indeed, but if i use optical fiber first I would have to find optical fiber 
, then im not sure that the web camera will be able to detect the fiber when the helmet is rotated , anyway i have the device ready and as soon as I find a visible light filter to put in front of the camera I will make a video
interesting idea indeed, but if i use optical fiber first I would have to find optical fiber , then im not sure that the web camera will be able to detect the fiber when the helmet is rotated , anyway i have the device ready and as soon as I find a visible light filter to put in front of the camera I will make a video
interesting idea indeed, but if i use optical fiber first I would have to find optical fiber
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