If you check out the schematics below you will see the error of your/my
ways. Assuming you are breadboarding the original SIMD1V0 (top left), the
pos of the solar cell should be connected to pin 1, the diode should be
reversed with the stripe to +V and the LED should be connected neg (cathode)
to 0V and pos (anode) to pin 2 through a 1K (typ) resistor. An FLED can be
used without a series resistor. Note the SIMD1V1 is functionally the same as
V0 but with the polarities reversed.

A 100K - 1M resistor across the solar cell helps with turnoff but the
SIMD1V0 and SIMD1V1 require almost complete darkness before switching. The
SIMD1V2 substitutes a 2N3904 for the diode and has a much faster turn on
with just a small drop in light level. PErhaps you can try this out and give
some more feedback on your findings. It is possible to add some positive
feedback to the circuit so that once the SIMD1V3 triggers it continues to
supply power to the LED (or other load) until the voltage drops below the
LED turn-on voltage at which point it starts to charge again if the light
level is high enough. That way it should be possible to trigger a SIMD1V3
bot when a shadow falls on the solar cell so it can try to move, ,jump, roll
out of harms away.

regards

wilf
>
>
> <<3SIMD1.gif>> -----Original Message-----
> From: Max Inggal [SMTP:Tacoman101@...]
> Sent: Sunday, April 23, 2000 11:24 AM
> To: beam@egroups.com
> Subject: RE: [beam] Need help with the SIMD1
>
>
> Ok I put pin 7 to ground and pin 14 to positive. I
> used a 1n4001 diode the neg end to pin 1 and pos end
> to pos. THe LED is neg end to pin 2 and pos end to
> pos. A 1F cap the neg side at ground and pos side to
> pos. THe solar cell is pos to pos and neg is to
> ground. If this is confusing I'll see if I can make a
> drawing of the schem to you.
>
>
>
> --- Wilf Rigter <wilf.rigter@...> wrote:
> > There are several versions of this circuit, so
> > you'll have to tell me a
> > little more about the breadboarded components, pin
> > numbers and LED
> > orientation.
> >
> > wilf
> >
> > > -----Original Message-----
> > > From: Max Inggal [SMTP:Tacoman101@...]
> > > Sent: Sunday, April 23, 2000 10:45 AM
> > > To: beam@egroups.com
> > > Subject: [beam] Need help with the SIMD1
> > >
> > > Ok I got Wilf's SIMD1 circuit all done on
> > breadboard.
> > > And just to see if it works I put a LED from the
> > > output of the inverter to the Positive. When I
> > let it
> > > charge for a bout 5 minutes or so with a 1F cap
> > and
> > > a2.7volt solarcell. For some odd reason the LED
> > turns
> > > on. Isn't this circuit designed to turn the LED
> > on
> > > when the lights go out? So I like some info on
> > why it
> > > happened and how I can fix it.
> > >
> > >
> > > Laterz!
> > >
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