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.

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