At 16:22 03/17/99 +0530, Ravi Pailoor wrote:
>I have a PIC controlling 2 stepper motors connected to a light source.
>
>I need to move the light source in a circle and a spiral.
>
>Does anyone have PIC / 8031 based algorithm to draw circles ?

i assume you have the step motors controlling the x and y directions
linearily, right? then you need a sine function. scott dattalo has one at
http://www.interstice.com/~sdattalo/technical/software/pic/picsine.html

for a circle, x and y are 90¡ shifted in their phase.

ge