Hello there!
Being fairly nifty at getting computers to do what I want them to do I decided to give myself a headache by branching into a bit of work on the electronics side. Unfortunately this is where my lack of knowledge starts to bite so thought I'd pop on here and hopefully get a bit of advice.
I'm working on a head tracking system which requires me to mount 3 IR LEDs onto the headset I use so I thought I might be able to power them through the USB port.
The LED's specs are as follows...
IR LED - 5mm 940nm
Forwards Voltage 1.5 - 1.6v
Forward Current 60mA
Having done a bit of searching around and a bit of calculation it seems to me that if I take a line off the USB port (5V Output)
and I place 3 of these LEDs in serial The numbers seem to come out about right. It looks like I might need a 10 Ohm resistor at the end of the chain but from what I understand LEDs are pretty hardy anyway so that might not even be necessary.
Could someone just check my thinking on this and make sure I'm not just getting something fundamentally wrong here?
Many thanks in advance.
Being fairly nifty at getting computers to do what I want them to do I decided to give myself a headache by branching into a bit of work on the electronics side. Unfortunately this is where my lack of knowledge starts to bite so thought I'd pop on here and hopefully get a bit of advice.
I'm working on a head tracking system which requires me to mount 3 IR LEDs onto the headset I use so I thought I might be able to power them through the USB port.
The LED's specs are as follows...
IR LED - 5mm 940nm
Forwards Voltage 1.5 - 1.6v
Forward Current 60mA
Having done a bit of searching around and a bit of calculation it seems to me that if I take a line off the USB port (5V Output)
and I place 3 of these LEDs in serial The numbers seem to come out about right. It looks like I might need a 10 Ohm resistor at the end of the chain but from what I understand LEDs are pretty hardy anyway so that might not even be necessary.
Could someone just check my thinking on this and make sure I'm not just getting something fundamentally wrong here?
Many thanks in advance.