Alt-BEAM Archive

Message #09612



To: beam@sgiblab.sgi.com
From: "Seamus Allan" seamus_allan@inet.net.nz
Date: Sat, 29 Jan 2000 15:24:11 +1300
Subject: [alt-beam] Re: fido



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I remember seeing in the Pitronics website a robot that was was being const=
ructed called the spider or something. anyways, it was based around a micro=
controller, and had ultrasonic transducers rigged up as a 'voice'. then the=
robot could communicate with the other robots with ultrasonic squeals, giv=
ing location, light levels, etc.

veeeery interesting....


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>
shaft ~ this cracked the molded pot metal very well and didnt seam to bend
the shaft at all ~ then I carefully put my cutters behind the now loosened
weight and closed down on the cutters ~ this pushed the weight forward and I
then just pulled it off with my hand

Steve



9614 Sat, 29 Jan 2000 15:47:26 +1100 [alt-beam] Re: FLED photovore question beam@sgiblab.sgi.com "Ben Hitchcock"
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Hi,

>From: "Jim Taylor"

> Other way around, anode is positive cathode is negative.
> Most caps have a big giant minus side running down the negative side.

Well, you're right, but it isn't really what Thomas wanted...

>> Hi all,
>>
>> I've gotta question primarily for Hitch Bencock :)
>>
>> On your FRED schema, using a "polarized" cap would negative go on the
>> anode
>> of the FLED?
>>
>> Thanks in advance,
>>
>> Thomas

Thomas, you are right as well. The negative end of the cap goes to the
FLED, and the positive end goes to the PNP transistor. It probably wouldn't
make a difference with the sort of voltages we are using, but it can't hurt
to do things properly.

I have updated this as shown in the attachment.

Also, you can use lower values of cap if you like. I used 0.22 uF instead
of 4.7 uF on my Seaplane.

Ben


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Attachment: schematic.gif

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9615 Sat, 29 Jan 2000 01:32:41 -0600 [alt-beam] Magbots "Jake" anyone know any webpages that give beginners help with magbots?


thanks..
jake



9616 Fri, 28 Jan 2000 23:37:20 PST [alt-beam] Re: FLED photovore question beam@sgiblab.sgi.com "Timothy Flytcher" >Other way around, anode is positive cathode is negative.
>Most caps have a big giant minus side running down the negative side.
>
I always just say "I hate cats!" ... cats=bad.....cathode =negative
forever locked into memory :)
Timothy...
______________________________________________________



9617 Sat, 29 Jan 2000 10:20:33 +0100 [alt-beam] Re: FLED photovore question "Thomas Pilgaard" Hi all,

and thanks for the replies.

>[snip]
> Thomas, you are right as well. The negative end of the cap goes to the
> FLED, and the positive end goes to the PNP transistor. It
> probably wouldn't
> make a difference with the sort of voltages we are using, but it
> can't hurt
> to do things properly.

Yes, I was a little confused being a novice in electronics. Am I right in
saying that turning it right will heighten the overall performance?

> I have updated this as shown in the attachment.

Great :)

> Also, you can use lower values of cap if you like. I used 0.22 uF instead
> of 4.7 uF on my Seaplane.

Uh, I think I'll have a go at the .22 caps or the likes then since they're a
lot smaller.

Thank and Cheers,

Thomas

>
> Ben
>

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