array of LEDs on keyboard, possible? - Overclock.net

helloworld_2046 · 08-22-09

I wanted to put an array of LEDs with forward voltage of ~3.2 in parallel or series on my keyboard. It will be powered off the scroll lock led, and i think it's rated in 5V. I want to know how many LEDs is possible to power off from that little voltage source. Any idea for how to calculate that is appreciated

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keith27 · 08-22-09

USB? Usb is rated for 500mA of current.

helloworld_2046 · 08-22-09

Thanks for the quick reply.
i only have a PS/2 keyboard lying around right now. I searched online and found the max current for the PS/2 port is 275ma.
Anyway, if i am using an USB keyboard, how much current I can draw out from that 500ma without interfering with the function of the keyboard? and i can't draw out 500ma from the scroll lock led source, right? so approximately how much current I can draw from that port and still having 15-20ma going thru all the LEDs?

08-22-09	#1 (permalink)
helloworld_2046 New to Overclock.net Join Date: Aug 2009 Posts: 2 Rep: 0 Unique Rep: 0 Trader Rating: 0	array of LEDs on keyboard, possible? I wanted to put an array of LEDs with forward voltage of ~3.2 in parallel or series on my keyboard. It will be powered off the scroll lock led, and i think it's rated in 5V. I want to know how many LEDs is possible to power off from that little voltage source. Any idea for how to calculate that is appreciated .

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array of LEDs on keyboard, possible?

08-22-09	#2 (permalink)
keith27 New to Overclock.net Join Date: Nov 2007 Posts: 1,670 Rep: 146 Unique Rep: 109 Trader Rating: 1	USB? Usb is rated for 500mA of current.

08-22-09	#3 (permalink)
helloworld_2046 New to Overclock.net Join Date: Aug 2009 Posts: 2 Rep: 0 Unique Rep: 0 Trader Rating: 0	Thanks for the quick reply. i only have a PS/2 keyboard lying around right now. I searched online and found the max current for the PS/2 port is 275ma. Anyway, if i am using an USB keyboard, how much current I can draw out from that 500ma without interfering with the function of the keyboard? and i can't draw out 500ma from the scroll lock led source, right? so approximately how much current I can draw from that port and still having 15-20ma going thru all the LEDs?

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