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On 6/27/05, Elizabeth Mabrey <emabrey@storming-robots.com> wrote:
> Hi
> Just wonder if there is anyone who has attempted to have lego light sensor
> to distinguish more colors than just black & white. Blue is too close to
> black... white is too close to white...
>
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> Elizabeth Mabrey
>
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Alone - it is not very good. I have seen a custom sensor with three
light sensitive elements and filters. you might be able to build a
crude one with one light sensor, one motor(slowed down with worm gear
or the micromotor), a wedge belt wheel, and coloured 1x1 round bricks
as filters pressed into the wheel.
I have in my head (I am going to attempt to build it after we have
moved) an interesting mechanism with a Ratchet, a lever
operating/pushing it round, a worm gear based mechanism to translate
motor rotation to a pushing motion, and a clutch gear so it does not
seize up/burn out the motor. This would mean that one pulse on to the
motor would push the ratchet around by a known amount. You would also
either need to no a return puile on the motor, or stick an auto return
system on the mechanism (freeing up the other motor direction for some
other action) with the worm gear.
Orion
--
http://orionrobots.co.uk - Build Robots
Online Castle Building RPG -
http://www.darkthrone.com/recruit.dt?uid=V30311I30328J30379X30379E30260X30277
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