Yes, the self flashing ones were the first suggestion but failed because:
1. We could only find red ones, no blue ones.
2. We could only find 5mm ones, not 3mm.
3. We wanted them to switch "left-right-left-right" not both blink at once.
4. It would be cool to build something so small wich a CPU. :)

/Magnus
----- Original Message -----
From: "Larry Green" <larry.green@SYMPATICO.CA>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, December 25, 2003 3:32 PM
Subject: Re: [EE:] Power problem in toy car


> Subject: [EE:] Power problem in toy car
>
>
> > Hi,
> >
> > for christmas this year a few friends and me decided to get out our old
> > track-car sets (correct name?) and build a big set.
> >
> > My friend has Sheriff's car www.student.bth.se/~pt98mvo/police2.jpg
> > in which we wanted the nice flashy lights. So, I set up a AVR AtTiny15
(not
> > a PIC, I know..) with a surface mounted 7805 on top (not much space
> > available) and a pair of LEDs with a resistor each.
> > www.student.bth.se/~pt98mvo/police1.jpg
> >
> > Problem: When the motor is running, the AVR is not getting enough power,
or
> > possibly not stable enough power.
> > I tried putting a 22uF condensator over the AtTiny, and that helped a
bit
> > but not enough. At idle speed it works, but at medium speed it starts to
> > reset and att full speed it does not work at all.
> >
> > There is also a condensator that came in the car, which might be busted.
> >
> > What can i do? Do I just need a bigger condensator for the chip, or is
there
> > another problem I need to address?
> >
>
> Would it have been easier to just use 'self-flashing' LED's? I just used
two in
> a project of mine as it saved battery power and I did not need to code the
flash
> rate in the PIC. Just a thought.
>
> Larry
>
> p.s. Hope you had fun with the cars, I built a permanent routed track a
few
> years ago that never sees daylight anymore, must get it out one of these
days
> and see if it still works.
>
> --
> http://www.piclist.com hint: The PICList is archived three different
> ways.  See http://www.piclist.com/#archives for details.
>

--
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