Alt-BEAM Archive
Message #07501
To: "'beam@sgiblab.sgi.com'" beam@sgiblab.sgi.com
From: Wilf Rigter Wilf.Rigter@powertech.bc.ca
Date: Wed, 10 Nov 1999 07:46:18 -0800
Subject: [alt-beam] Re: solar head questions..
Couple of questions:
a. What head circuit are you using : the 2Nv bicore as discussed in your
progress report?
b. What solar engine?
c. What is the supply voltage you use during the testing?
Couple of points:
1. The 74ALS245 uses about 20ma just by itself: yikes!
2. You can connect the 74ALS245 as shown in the attached.
3. You get a lot more motor power by raising the "solar" supply voltage.
ie use a chloroplast SE or use a 1381U
4. Higher supply voltage requires increased voltage ratings on the solar
cell, caps or batteries (ie 6V)
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411
> -----Original Message-----
> From: Brad Guillot [SMTP:mach50@netzero.com]
> Sent: Tuesday, November 09, 1999 5:07 PM
> To: beam@sgiblab.sgi.com
> Subject: Re: solar head questions..
>
>
> Wilf Rigter wrote:
>
> > Well I would say, "read the manual" but seriously,
>
> I did , it was real late, i probally didn't catch the details
>
>
> > 1.what motor driver?
> ok. the circuit will directly power a led, for some reason not a
> pager
> motor. who woulda knew?(I'm not the only one with this problem)
> My analog meter tells me its like 20mA output, my pm needs like 40mA
> and would prefer 80mA or so. so i attached a 245 driver and it works
> real nice. i was wondering how to connect it to the circuit so it was
> only on when the motors kick on. I tried like 10 differnt ways and most
> of the time it made the circuit go haywire. the times it stayed normal,
> i didn't achice my goal(the driver was still on). i sopose it would just
> work in parrell withthe solar cell because it doesn't drain that much
> power when it is not in use, but in solar apps. every little bit helps.
>
>
>
> > 2.Without the solar circuit ie battery power the light stays on. Darrell
> > added the FLED to "attract attention" to the solar PShead when it is
> ready
> > for action.
>
> I am using the solar circuit powerd by a battery. my problem was that
> when the motor turns, the fled is soupposed to turn off. mine stays lit
> even when the motor turns. i found a way to make it stop when the motor
> turns on,(grounding pin 2) but the entire circuti the dies because the
> fled is attached to the enable/disable pin. Would detaching it from that
> pin make it work?
>
>
> > 3.That certain component wouldn't be pin 6 and 8 of the HC240? Those
> should
> > be connected to 0V (instead of floating as shown on Darrell's layout
> > drawing. Also make sure you add a small (eg 10uf /10V) electrolytic
> > capacitor from pin 20 to pin 10. The actual cap value does not matter
> much
> > but it should have relatively direct connections with short leads. This
> > stops high frequency oscillations which upset normal circuit operation.
>
> Thank YOU very much!
> that is very helpful
>
> thanks
> brad
>
> > > -----Original Message-----
> > > From: Brad Guillot [SMTP:mach50@netzero.com]
> > > Sent: Tuesday, November 09, 1999 3:04 PM
> > > To: beam@sgiblab.sgi.com
> > > Subject: solar head questions..
> > >
> > >
> > > These are some questions/ problems a few of us have been having with
> the
> > > solar head project. I thought i'd ask.
> > >
> > > 1. for use in solar power, Where would you hook up the motor driver?
> > >
> > >
> > > 2. The circuit works but he active circuit indincator light NEVER
> stops,
> > > even when it moves. What's up?
> > >
> > >
> > >
> > > 3.The circuit seems to work right when i move my finger over or touch
> a
> > > certian component. Why does it do this and how do we fix it?
> > >
> > >
> > >
> > > These are some problems myself and someothers have been having and any
> > > help or input would be much appricated. The responses would help all
> of
> > > us, I think. If anyone has a question to add to this lidt plese do so
> be
> > > cause it will help us all understand better and mabye avoid future
> > > problems.
> > >
> > > thanks,
> > > The Solar Head Project people
> > >
> > >
> > > p.s.
> > >
> > > for some pictues and my progress to date, go to
> > > http://mach5.freeservers.com/beam/head.html
> > > __________________________________________
> >
7502 Wed, 10 Nov 1999 16:20:50 GMT [alt-beam] solar head misery beam@sgiblab.sgi.com "Jason -"
format="flowed"
Hie....i dont know why after i wired up the power smart head schematic from
darrel's site(without the SE like the one below)...the thing dont seem to
work...it just stays there even when i cover the
other LDR on one side...how can i test if my solar head is working or not
cause it
has been giving me a headache after the whole night of wiring i gave
up..thanks a
lot
jason
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