Subject:
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Re: Homemade LED Bricks
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Newsgroups:
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lugnet.robotics
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Date:
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Mon, 15 Nov 1999 06:28:38 GMT
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Original-From:
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Maneesh Soni <maneeshsoni@hotmail.=nospam=com>
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Viewed:
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423 times
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Hi!
It is not possible to have a two-terminal and dual colour LED. One of the
three terminals is a common negative terminal of two LEDs that are inseide
the same casing. The two remaining terminals are used to connect positive
side of battery to.
You may try to permanently connect the common negative terminal to the
battery. And then alternate the positive connection from the battery between
the positive terminal of the two LEDs.... that will make them glow
alternately.
Maneesh.
> From: tking@together.net (Terry King)
> Reply-To: tking@together.net
> To: lego-robotics@crynwr.com
> Subject: Re: Homemade LED Bricks
> Date: Mon, 15 Nov 1999 01:21:37 GMT
> Message-ID: <MPG.12968d98800280ef9896ba@lugnet.com>
> References: <FL25M6.455@lugnet.com>
> Precedence: list
>
> I've made a few LED 'bricks, and am about to make some more
> like "Flashing towers" with some of the ??name?? tapered
> cones and transparent small round tops.
>
>
> 330 Ohms is my pick; plenty bright at about 20 Ma for most
> LEDs and dims nicely with "Set Power". I usually run
> power level 5 with efficient LEDs and they are plenty
> bright. The AVERAGE current must be about 10 Ma.
>
> My 8 year old granddaughter was fine last week with the concept
> that "you have to write a separate TASK for the computer if
> you want it to blink the lights at the same time it's
> driving the robot". She wrote task blinker() pretty fast, and
> start blinker and stop blinker were obvious.
>
> I have two separate LEDs 'back-to-back' in most of mine. The
> "bicolor' LEDs I have from Radio Shack have 3 terminals and
> cannot be run so that reversing polarity changes the color.
> Anyone seen a TWO-TERMINAL bi-color LED??? It would be nice for
> fitting into a small transparent beacon.
>
> I have successfully made contacts on my bricks with copper foil
> tape on a standard brick. I'll put up a .JPG if someone can tell
> me where there is an appropriate Binary location on this server....
>
> GOTTA have Blinking Lights!!!!!
>
>
>
> --
> Regards,
> Terry King ...In The Woods In Vermont
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Message has 2 Replies:
 | | Re: Homemade LED Bricks
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| Maneesh Soni writes: > It is not possible to have a two-terminal and dual colour LED. Sure it is. You connect them back to back, so that positive current gives you green light, negative current gives you red light, and alternating current gives you (...) (25 years ago, 15-Nov-99, to lugnet.robotics)
| | | Re: Homemade LED Bricks
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| =>From: "Maneesh Soni" <maneeshsoni@hotmail.com> =>... =>It is not possible to have a two-terminal and dual colour LED. One of the =>three terminals is a common negative terminal of two LEDs that are inseide =>the same casing. The two remaining (...) (25 years ago, 15-Nov-99, to lugnet.robotics)
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