Alt-BEAM Archive
Message #08094
To: beam@sgiblab.sgi.com
From: "Timothy Flytcher" flytch@hotmail.com
Date: Thu, 02 Dec 1999 15:39:12 PST
Subject: [alt-beam] Re: D'oh! Head Revelation
Sounds interesting... Richard ...I like it :)
Have you given any thought as to what kind of stop you are going to use???
You can't just use a mechanical one for two reasons... 1 current draw and 2
stripped gears... So some kind of limiting switch... but how??? I would love
to see your solution :)
Timothy...
>Hey all,
>
>I just thought of something...I had proposed using a head controlled pot to
>drive a +Phototropic robot body a couple of weeks ago. Inside of a R/C
>servo is a gear train, positioning pot, circuitry, and a motor. The driver
>circuit could be removed and a BiCORE (or PSH) circuit put in it's place
>and the pot leads going out to the robot's body circuitry. The whole thing
>could be housed in the box for the servo! The "eyes" are the only thing
>that needs to move. Why mess with the weight of the entire head. It
>dosen't have to go all the way around because it's mounted to a mobile
>body. I have something like servos at home (gleaned from an old "Teddy
>Ruxpin") and I'll give it a shot tonight, if I can find my 74HC240. I left
>it right over there...
>
>Wondering Aimlessly,
>
>Richard
______________________________________________________
8095 Thu, 02 Dec 1999 17:38:13 -0700 [alt-beam] Re: D'oh! Head Revelation beam@sgiblab.sgi.com robertm@idcomm.com (Robert Morris) How about some type of blinders like they use on horses?
Just mount a piece of black plastic, cardboard, etc. on each side
of the servo body, then the eyes will only turn until one of them
becomes blocked by the blinder. They will then stop because the
blocked eye will be in a more shadowed area than the other eye.
At 03:39 PM 12/2/99 PST, you wrote:
>Sounds interesting... Richard ...I like it :)
>Have you given any thought as to what kind of stop you are going to use???
>You can't just use a mechanical one for two reasons... 1 current draw and 2
>stripped gears... So some kind of limiting switch... but how??? I would love
>to see your solution :)
>Timothy...
>
>>Hey all,
>>
>>I just thought of something...I had proposed using a head controlled pot to
>>drive a +Phototropic robot body a couple of weeks ago. Inside of a R/C
>>servo is a gear train, positioning pot, circuitry, and a motor. The driver
>>circuit could be removed and a BiCORE (or PSH) circuit put in it's place
>>and the pot leads going out to the robot's body circuitry. The whole thing
>>could be housed in the box for the servo! The "eyes" are the only thing
>>that needs to move. Why mess with the weight of the entire head. It
>>dosen't have to go all the way around because it's mounted to a mobile
>>body. I have something like servos at home (gleaned from an old "Teddy
>>Ruxpin") and I'll give it a shot tonight, if I can find my 74HC240. I left
>>it right over there...
>>
>>Wondering Aimlessly,
>>
>>Richard
>
>______________________________________________________
>
8096 Thu, 2 Dec 1999 20:38:21 -0500 [alt-beam] Re: D'oh! Head Revelation "Richard Caudle" > Have you given any thought as to what kind of stop you are going to use???
> You can't just use a mechanical one for two reasons... 1 current draw and
2
> stripped gears... So some kind of limiting switch... but how??? I would
love
> to see your solution :)
> Timothy...
There's another "d'oh!". I didn't think of that. I was thinking that the
'bot woulkd be turning fast enough to keep it from being a problem, but your
point is well taken. It would be nice (and BEAMish) if there were a circuit
like the voltage sensor that would shut off when a certian current level is
reached...Wilf? I could use limit switches to open the enable lines, but
there would be no way to re-enable it once is was shut off. Could also be a
latching relay or some such thing that would shift the other direction when
the limit is closed.
Good Question! Nuts!
Richard
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