SX bot wheel movement

Henrymou

ok
I am new to the SX but not robotics
why won't this code move the servos I installed at SX pins RB.7 and RC.7?

DEVICE SX28, OSC4MHZ, TURBO, STACKX, OPTIONX
FREQ 4_000_000
ID "MOTOR_MOVEMENT"

do
PULSOUT RB.7, 800
pause 500
loop

help!
-Henry

PJAllen

Henrymou,

You have --

do
PULSOUT RB.7, 800

[color=red][b]pause[/b][/color] [color=red][b]500 [img]http://forums.parallax.com/images/smilies/skull.gif[/img] [/b][/color]
 
loop

Anybody "not new" to robotics would know that the servo refresh rate is 20msec --·but you're pausing for 500msec (1/2 sec.)

Try PAUSE 19 (maybe PAUSE 20.)

Bean

800 is WAY too long for the pulsout.
150 is centered.

DO
PULSOUT RB.7, 150
PAUSE 20
LOOP

Bean

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Student: I don't know and I don't care
Teacher: Correct !
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·

Henrymou

the computer tells me the list index is out of bounds, what now?

PJAllen

·

DEVICE SX28, OSC4MHZ, TURBO, STACKX, OPTIONX
FREQ 4_000_000

 
PROGRAM Servos
 
Servos:
 DO
  PULSOUT RB.7, 150
  pause 20
 LOOP

Henrymou

WHOO! that finally worked!
thx PJ Allen, will you b my friend?

Henrymou

ok, the servo is moving a little slow, how can I make the servos:
speed up over time?
slow down over time?
and move forward and backward?
thx
-Henry

Franklin

Put in a for/next loop that increments and decrements the pulsout value.

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- Stephen

Henrymou

but how do I make the servos go forward and backward usin' SX/B code?

D Faust

DO
FOR pulse = 100 to 200
 PULSOUT RB.7, pulse
 PAUSE 20
NEXT
FOR pulse = 200 to 100
 PULSOUT RB.7, pulse PAUSE 20
NEXT

LOOP

If it is like PBASIC then this would make the servo go all the way one way to all the way the other way and back.

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LOOKDOWN ThisThread, [noparse][[/noparse]Your_?, My_?, Cool_Thing], looknum
LOOKUP looknum, [noparse][[/noparse]1, 2, 3], subnum
ON subnum GOTO Hope_this_helps, Thanks!, WOW!!
END 

Henrymou

yeah, but that program ain't working, I think you have a typo, yet I don't know what it is.

PJAllen

henrymou,

Is this a "continuous" or a standard servo?

Henrymou

oh, neva mind, I added
pulse var byte
at da top of the program, and now it works
thanks!

can I have a few example subroutines, then I will have no more questions
you know
like
Forward
Left
Right
Backwards
and so on
thx
-Henry

D Faust

At least try to make up the subroutines, and if they don't work then post for someone to check them.··People on this forum usually don't want to do the work for you, but will help you through it.· Are you experienced in PBASIC?· What I gave you was just the same type of code I use for my boe-bot (which is PBASIC, I have NO experience with SX/B).· For a start with those subroutines, 100 is full one way, 150 is center, and 200 is full the other way. To find out the directions just do a couple of tests.

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LOOKDOWN ThisThread, [noparse][[/noparse]Your_?, My_?, Cool_Thing], looknum
LOOKUP looknum, [noparse][[/noparse]1, 2, 3], subnum
ON subnum GOTO Hope_this_helps, Thanks!, WOW!!
END