Servo question

Lautarocondor

I am using the BS2 to control a set of servos, but the movement jerks too much. I am using the PULSOUT command similar to:
·
Start:
·· PULSOUT 0, 190·· PAUSE 20GOTO StartIt either moves too fast (smooth) or when I increase the PAUSE command it (jerks) to the next position. Is there a way to smoothly control a servo at slow speed? I am using a push button like control, not a pot. THANKS!

Mike Green

Yes, you have to change the pulse width slowly ... whatever that means for you. The servo is just trying to reach the new position as quickly as possible. Perhaps change the pulse width by no more than 10 for each 20ms cycle like this:

goal var word ' desired pulse width
srvP var word ' actual pulse width
start:
   srvp = 750
   goal = 750
cycle:
   ' calculate a new goal
   if srvp < goal then
      if goal - srvp > 10 then
         srvp = srvp + 10
      else
         srvp = goal
      endif
   endif
   if srvp > goal then
      if srvp - goal > 10 then
         srvp = srvp - 10
      else
         srvp = goal
      endif
   endif
   pulsout 0,srvp
   pause 20
   goto cycle

Lautarocondor

Thanks alot. I'll try this tonight.