Subject:
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Re: At last, RC servos are a go!
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Newsgroups:
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lugnet.robotics
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Date:
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Tue, 4 Jan 2000 17:16:50 GMT
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Original-From:
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Simon Bogaert <simon.bogaert@advalvas.be(NoSpam)>
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Viewed:
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670 times
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Hello,
Thanks for all the work you'v done. I'm looking forward to seeing and
building the "controller" described in the original message. I'm not sure
about what a "servo" is; any help is welcome.
Kind regards,
Simon
----- Original Message -----
From: Pink Tail <pinkmice@borg.com>
To: <lego-robotics@crynwr.com>
Sent: Saturday, January 01, 2000 10:35 PM
Subject: At last, RC servos are a go!
> I have finally cracked the RC servo/RCX connection.
>
> A fairly simpe PIC based device built into one of the larger
> battery housings. The one that comes with 8735.
>
> I hollowed out the on/off switch compartment and installed
> the tiny circuit. It still uses the red connector to connect to
> the RCX. The two square holes, where the switches used to
> be are each occupied by three sets of servo connectors, so
> it can drive a total of six servos.
>
> The motor output from the RCX is decoded as a serial
> data stream. There are 14 possible codes, 7 on each
> wire from the RCX. In my case I have the PIC programmed
> to set a selected servo left or right of center for power settings
> 0 - 5 and set it to center on power 7. Reverse or forward
> controls which side of center is desired.
>
> There are of course numerous other operational modes
> which could be programmed into the PIC, but the one I
> have chosen for now has a very specific purpose.
>
> I can now use the RCX to control the pneumatic parts!!
>
> Each servo drives a lego style valve. Actually, the servo
> arm is attached to the valve body, the center of rotation
> being set to the location of the dimple. The valve "lever"
> is held still in a technic beam hole. Since the pneumatic
> tubes are flexible, this doesn't matter.
>
> I am in the process of converting the schematics to jpg
> format. If anybody out there is interested, let me know
> and I'll try and email you the info.
>
> I'll be back in touch sometime in the next 1000 years :)
>
> JB
>
>
>
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