Re: Stepper controller / driver for powerfeed

> You can do a ramp with the 555. You need a relatively large resistor
> and capacitor to do it (since the time constant needs to be around the
> ramp time you want, likely in seconds.)
>
> I don't know the specific circuit to do this off the top of my head,

but

> it's possible and shouldn't take too many extra parts.
>
> If you need some AVR code, let me know which chip you may use. The

code

> is pretty straightforward, especially for chips with the advanced PWM
> generator (mostly the megas, but maybe some tinys as well).
>
> - Steve

I got the 555 timer chip to work, and it works real good. It will
ramp automatically, by way of the trim pot.

Ideally, yes it would be nice to set it to a specific rate and press a
button to ramp up & down.

I'm using the atmega8 chips, in C language. If there is code or links
I would appreciate those too, thanks!