Troubleshooting usb powerbank 3 IR LED setup
I am building a wireless google cardboard so that I can play PC games on my phone through the VR headset rather than crappy app games.
Basically a wireless Oculus Rift, however I know it wont be anywhere near as good it's just a fun project.
I have Infrared LEDs which I will use with freetrack and my modified webcam without IR filter to do my head tracking.
I am trying to power 3x Infrared LEDs from a usb powerpack. Here is the one I am using http://www.ebay.com.au/itm/221468778309?var=520334132263&ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
The reason for using this as a power source is I can easily attach it to the headstraps on the google cardboard, it is just about the smallest power setup I can think of (better than using 3x AA batteries), it was cheap, and it outputs 5v which is perfect for powering 3x IR LEDs with a forward voltage of 1.6v and 60mA current.
When I use this powerbank to power a single LED without a resistor and I look at it through my webcam, even with all the lights off and the webcam 5mm away from the LED you can barely see it light up.
I tried the led on another powerbank I have here which is 10,000mAh so it is massive, and it was much brighter on the webcam. I then used my samsung TV remote and pressed a button while aiming at the webcam and it was EXTREMELY bright. Basically I want the LED to be as bright as my remote, or as much as the LED is capable of.
Why would the powerbank show the LED so dull? I have confirmed it is outputting 5v, but when I try test the current with a 'usb charger doctor' between the charger and usb cable, or a multimeter between the wire and the LED it shows zero current.
I should be able to just connect all LED in series with a small resistor and it should just work at full brightness, but the power bank cannot even power a single LED well enough to see properly on the webcam.
It's becoming really frustrating, any idea what's happening? Best solution?