Here are several LED Lego bricks. Each has its own features, is
manufacured to a professional standard and, if necessary, they can be custom-made.
These examples are built 4 Lego 'units' high. They are designed for use with the
Lego Mindstorms RCX with which they are 100% compatible, although they will work
equally well with any Lego 9V system. They can be used decoratively, although I
originally built them to help me debug RCX code.
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The first example is built into a 2x4 Lego brick. It contains a red LED and
a yellow LED. In an RCX application, setting the motor output to forward makes
one LED light and setting it to reverse makes the other light. When the motor
output is off, both LEDs are off.
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This is the 2x4 twin LED brick in action. You may download the NQC code for
the program which is running in my RCX here.
As with the single LED version shown below, the brightness of the LEDs can be
altered by setting the motor output speed.
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The second type is built into a 2x2 Lego brick. It contains only one LED, however
it will change colour depending (in an RCX application) on the direction in
which the motor output is set. Setting the motor output to one direction
makes the LED light green and setting it in the other makes it light red.
When the motor output is off, both LEDs are off.
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This most recent addition to the collection is a flashing red LED mounted
in a 2x2 black brick, as the bi-colour version above. The difference is that
this device flashes twice a second without help from any other controller.
That is to say it can be attached directly to a 9V battery box and it wil flash
quite happily.
This one comes in two flavours. Externally they are identical but one version
must be connected to the battery in a specific orientation. It will only work
with the power connection in two of the four possible positions. Connecting it
backwards will do no harm - it just won't work! The second (and more expensive)
option is less fussy. You can connect the power to it in any of the four
orientations for complete success.
These items are ideal for train EOD lights.
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As a final piece of showing off, here is a set of LED running lights.
I had to do this. (Sad, isn't it?) You can find the NQC code for this program here.
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These units are neither manufactured, nor endorsed by the Lego group.
Last update: 09-Dec-2001
Since 23-Apr-2001
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