Alt-BEAM Archive
Message #06017
To: beam@sgiblab.sgi.com
From: Scott Burns s-burns@uiuc.edu
Date: Fri, 10 Sep 1999 09:04:53 -0500
Subject: [alt-beam] Re: power_smart_head fest
Dear Wilf:
The virtual beam workshop sounds great. I tried building the PSH and was=20
able to get the square waves to the motor to change duty cycle with changes=
=20
in relative LDR illumination, but they were always in phase. The motor=20
never saw a voltage differential across it. I'm anxious to figure out what=
=20
I did wrong.
Regards, Scott
At 07:42 PM 9/9/99 -0700, you wrote:
>Hi Bumper,
>
>What do you think of a little "t=EAte-=E0-t=EAte-f=EAte" to help you get=
your head
>together (groan!). If you can stand the occasional pun, I could help you
>step by step through the process and posting the dialog on the list would
>be interesting for others to follow. Attached is simplest schematic for the
>Power_Smart head circuit re-organized a bit to make it more understandable.
>That design may be a good starting point, assuming you have access to a
>74AC04. If not, then a 74HC04 from Radioshack will work too but would
>require an h-bridge such as the fetbridge described earlier. Otherwise the
>240 version can be used but first we should agree on pin numbers, layout
>component values, etc. The LEDs on the buffer outputs help a lot with
>debugging and tuning. If you are interested you (or I) can make up a layout
>drawing so that we can build this unit together, step by step and debug as
>we go along. Sort of like a virtual BEAM workshop with anyone interested,
>joining in and providing their feedback and progress reports. Let me know
>what you think.
>
>I was also thinking of some kind of head contest:
>
>Competitive - where the heads go "head to head" wielding laser pointers
>(well LED spotlights anyway) to blind or poke the other guys eyes out and
>generally and try to screw up the other heads. (grin)
>
>Cooperative - using laser pointers (or LED spots), draw beautiful patterns
>on the ceiling while doing a little beam tech "pas de deux".
>
>regards
>
>
> Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
>
>
> > <>
>
>
>
>
>
> > -----Original Message-----
> > From: Bumper314@aol.com [SMTP:Bumper314@aol.com]
> > Sent: Wednesday, September 08, 1999 10:40 PM
> > To: beam@sgiblab.sgi.com
> > Subject: Re: PS HEAD V2
> >
> > In a message dated 9/8/99 9:24:07 PM Pacific Daylight Time,
> > beamtastic@yahoo.com writes:
> >
> > > Wilf, is there a big difference in the performance between v1 and v2=
of
> > > the PSH? I was just curious, since I built the v1 PSH and it performs
> > > very well for me..
> > > I'm sure this will be of interest to others, so I'm posting it to the
> > > list..
> > > thanks..
> >
> >
> > Well me and my bad luck were unable to breadboard this little
> > circuit...very
> > very simple circuit...sigh..so im curious if it could be because i used
> > .1=B5f
> > caps instead of .01?
> >
> > steve
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