Alt-BEAM Archive
Message #12172
To: beam@sgiblab.sgi.com
From: Ben Hitchcock beh01@uow.edu.au
Date: Mon, 20 Mar 2000 13:58:37 +1100 (EST)
Subject: [alt-beam] Re: FRED circuit (beginner)
> Ok...I did some of your recommended tests. When I shorted out the FLED on
> engine 1(the one with the non-working motor) the FLED stopped flashing but
> the motor still did not turn on. For SE 2(the one with the working motor)
> The FLED already was not lit because the motor was using all the power, but
> the motor would not turn off when the FLED was shorted. Did you recommend
> replacing the 4.7uf cap with a 4700uf? or did you mean to hook the 4700
> directly to the battery?
What I meant was don't supply the circuit direectly from the 9V battery.
Use a 1k resistor in series with the battery. This will stop the motors
from burning out.
You will need a power storage cap - from 4700uF to 1 F will work. 4700
will give very brief steps, 1F will give huge ballerina-style steps. The
4700 uF cap should be connected to your circuit where it says to on the
schematic (to + and - rails) and the 9V should be connected with a 1k
resistor in series with it.
Ben
12173 Sun, 19 Mar 2000 19:51:59 -0800 (PST) [alt-beam] Re: Mark Tilden Tact(Mr.mark T please reply) beam@sgiblab.sgi.com Daniel Grace I think most of the things that Mark uses can be
bought from solarbotics Http://www.solarbotics.com
~Daniel
--- Jason - wrote:
> Hie ,
>
> I am just wondering what material does mark T use to
> construct the legs of
> his walkers.....it seemed so configurable and can be
> easily be
> bent......just like in the extreme machine's show
> incredible robot
> showcasing him making a two motor walker under one
> hour........and what did
> he use for a tactile sensor...cause the tactile
> sensor i see in his recent
> botz are so tough......are they piano wires?....and
> if i were to make the
> tactile sensor can i use other materials other than
> piano wires as it is
> really hard to be found here in the east..thanks a
> lot
>
> p/s: i hope mark will reply me.....thanks
>
>
> jason
>
>
>
______________________________________________________
>
12174 Sun, 19 Mar 2000 22:50:46 -0600 [alt-beam] Re: H-Bridge Question (Newbie) beam@sgiblab.sgi.com SG At 05:38 PM 3/19/00 -0800, you wrote:
> Hey, Sparky. What did you do with Lotus? Bridges hooked directly
> to the "complete walker" outputs?
>
yup directly to the circuit's motor outputs.
to clarify: I used the 6 transistor H-Bridge in the H-Bridge tutorial on
Beam-Online.
I mentioned I am using a 9V battery on the h-bridges. This is NOT true on
Lotus. He uses a 3.8V. I have a small walker (horizonal frnt motor)
that is powered by the 9V, BUT uses the same 6 transistor H-Bridge config
that is in the Beam-Online H-Bridge tutorial.
-Sparky
ps
still lookin for someone to come up with a reverser for that 240 uCORE!
-sparky
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