Beginner + Servo

[james]

Hello,

Am in my first month of learning to program, and have completed most projects in the " PicBasic Projects - Book, by : Dogan Ibrahim ".

I am currently trying to control a servo motor(Tower Hobbies: STD TS-53) via a toggle switch. Switch one way to turn the servo Clockwise, opposite position for Counter Clockwise. Center position to center the servo

when power is applied my servo spins to the center and then vibrates and will not respond to switch. I am new and looking to learn, if I am using code improperly please inform me, I dont want to start off on the wrong foot.

using pic16F648, my code is as follows :
Code:
'PICBasic pro manual servo control program

symbol switchCW = porta.1
symbol switchCCW = porta.0
symbol servo = portb.0


Position var byte


start:

'look at switches on Port A
IF switchCW = 1 and switchCCW = 1 then goto loop

Position = 150
Pulsout servo, Position
pause 18

loop:
if SwitchCW = 0 then
Position = 130
Pulsout servo, Position
Pause 18
endif

If SwitchCCW = 0 then
Position = 170
pulsout servo, Position
Pause 18
endif

Pause 18
Goto loop
*****************
end of program....

Thank you, for any feedback