Subject:
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Re: Lego Remote Control - Here's The Scoop
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Newsgroups:
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lugnet.technic, lugnet.robotics
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Date:
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Sat, 31 Mar 2001 17:03:12 GMT
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Reply-To:
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dstaudt@hotmailANTISPAM.com
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Viewed:
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76 times
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what about newmatic switches? all lot of sets have them to
John Barnes wrote:
>
> Hi !
>
> As some of you have noticed, Ms. Jennifer Clark showed off her beautiful
> new truck model at the Cheshire Legofest recently. The truck was equipped
> with a prototype radio control system which she has been kind enough to
> test for me.
>
> The prototype system has 8 control channels each providing a fairly basic
> forward/off/reverse type function. Both the transmitter and receiver used
> small UHF radio modules which operate in the 418 - 433 MHz band.
>
> It is not permitted to build radio transmitting equipment for sale without
> going through lengthy regulatory agency compliance testing, and for the
> possible sales volume for a product like this, the cost of such testing would
> dominate the price.
>
> I have therefor been actively looking for an alternate strategy and I have
> found
> one which I think may help.
>
> Digikey, a large supplier to industry and hobbyist alike here in the US has
> recently taken on the Linx company's product line. This product line includes
> an 8 button 418 MHz remote control and a 5 button keyfob remote control.
> Although they list 315/418/433 MHz as options, they only carry the 418 MHz
> version. I have successfully built a 4 channel system for use with either
> of these
> two devices. Using the 8 button control, the four channels are all off by
> default.
> Pressing one of a pair makes the channel drive the motor forward, pressing the
> other makes the motor go in reverse. Buttons may be pressed simultaneously
> to run more than one motor at once. Using the 5 button keyfob, which has four
> oval buttons surrounding a central round one, I am decoding the round one as
> a "shift key" allowing the four buttons to be switched from one pair of motor
> outputs to the other.
>
> Please investigate www.linxtechnologies.com - linx - oem. This will show you
> some of the radio modules. Then consult www.digikey.com and look up;
>
> CMD-KEY5-418
> CMD-HHTX-418
> RXM-418-LC-S
>
> Ok. Here's the scoop. I am looking for a couple of volunteers who are
> interested
> in trying out this technology.
>
> You must buy either of the first two items from Digikey if you live in the
> US* and
> pay me for the receiver module. I plan on building a few prototype systems to
> see how acceptable they to are to use. Apart from paying for the two principle
> radio components, there will be no other charges.
>
> The receiver will be constructed in a 4 x 6 stud x 2 2/3 brick high lego
> enclosure.
> It will have electric plating on top for the motor connections and a
> pigtail wire with
> a Lego 2 x 2 electric connector on the end to go to a Lego battery pack (6
> x AA or
> 1 x 9v). The antenna is internal.
>
> This is not a Mindstorms/RCX add-on, this a remote control for a model of some
> kind. I cannot legally modify a transmitter to add RS232 capability.
>
> However;
>
> I have also built a handy little RCX add-on which is a receiver-sensor.
> Basically
> this enables you to signal an RCX via on of its sensor ports from a handheld
> transmitter as described above. In this case, I convert the receiver's digital
> output to an analog value for input to the RCX so it can "measure" which
> combination of buttons have been pressed - a la the touch sensor mux idea.
>
> This is really only of benefit in situations where you want supervisory control
> over a multiple RCX project. (You cannot easily use the IR remote with multiple
> RCXs in my experience. This is more expensive than the IR remote!)
>
> Please feel free to contact me about this project, if you are interested.
>
> John Barnes
>
> ps:
>
> *If you do not live in the US;
>
> Please investigate whatever may be locally available as far as
> transmitters. The
> receiver system I am using uses the Linx module as listed above and a PIC
> microcontroller to decode the commands. The Linx transmitters use a Holtek
> HT640 chip but I am sure that other commonly available devices would be
> equally easy to decode. If you live in the UK, please check out Radiometrix. I
> noticed their logo on the some of the Linx modules, so they must be tied
> together
> somehow. Perhaps the little transmitters are available legally in the UK.
> If you
> live elsewhere in the world and there are no suppliers of this kind of
> stuff, check
> out your national frequency allocation to see if the 418 MHz band is free for
> low power telemetry and remote control function use. We may be able to come
> up with some kind of plan to get you equipped.
--
Daniel Staudt <dstaudt@hotmail.com>
Lugnet NUT #872
I'm out of my mind, but feel free to leave a message.
<http://www.geocities.com/ResearchTriangle/5404/>
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Message is in Reply To:
 | | Lego Remote Control - Here's The Scoop
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| Hi ! As some of you have noticed, Ms. Jennifer Clark showed off her beautiful new truck model at the Cheshire Legofest recently. The truck was equipped with a prototype radio control system which she has been kind enough to test for me. The (...) (24 years ago, 23-Mar-01, to lugnet.technic, lugnet.robotics)
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