Re: [Gumstix-users] Yellow LED

[Dave H. <dhy...@gm...>]

Hi Michael,

On 11/2/06, Black, Michael <Mic...@es...> wrote:
> Found this:
> http://www.mouser.com/catalog/628/101.pdf
>
> Looks like the LTST-C170YKT is just 2 lumens.
> The blue one is 28-112 depending on the voltage.
>
> Looks like LTST-C171KSKT is 50 lumens at 2V so might be the one you want
> to try.
>
> The next question is whether or not the voltage on those lines is
> controllable?  The other yellow one that has variable voltage is
> considerably less voltage than the blue.

The voltage on those lines isn't controllable, but that's not what you
want to change anyways. You really want to change the current, which
is controlled by the current limiting resistors.

Unfortunately, on the robostix, this is a really tiny 8 pin 330 ohm
resistor pack. The simplest thing to do would be to rotate the LED 90
degrees so that the end closest to the power jack is disconnected.
Then wire in the desired current limiting resistor and a wire over to
the robostix.

If you don't want to rotate the LED, there is a trace that could be cut...

-- 
Dave Hylands
Vancouver, BC, Canada
http://www.DaveHylands.com/