AVR-Chat

On Mon, Nov 10, 2008 at 4:02 PM, Sander Pool <sander@tungstentech.com> wrote:
>
> This is probably obvious to the more experienced experimenters here but
> when I worked with servos and a mega128 I had spurious problems with my
> code that I traced back to the power supply getting 'hit' by the servos
> when they were being driven. Make sure you have separate power (common
> ground, of course) and a driver between your µC and servo.

Yes, the servo drain can be large, and however you handle the power,
you need to take that into account.  I also had some chip failures
until I inserted some series resistance in the control leads to the
servos. 100 ohms if I remember right.  I never bothered to work out
what caused it, the 100 ohm was an acceptably cheap fix.


> As I recall I used one of the PWM channels.

Yup, that's another way to do it. :)