PULSOUT command hassles

Timmy

g'day all,

having some hassles with pulsout which i am using to instruct my servo. I've included my code. The problem is, that the servo is moving to the far right and trying to go beyond, ie 2ms. If I remove the "pulse" variable from the PULSOUT command and replace it with an integer like 750, the pulsout command works fine. I am certain that you can use a variable label for the pulsewidth value in PULSOUT.

' {$STAMP BS2}
' {$PBASIC 2.5}

servo VAR OUT0
pulse VAR byte
pulse = 500

start:
pulse = 20 + pulse
PULSOUT servo, pulse
PAUSE 20
IF pulse >= 1000 THEN endseq
GOTO start

endseq:
END

Timmy

hi folks,
i have solved my own problem, I set up a debug window and noticed that there was an overflow. Once I changed the variable from byte to word it worked.

cheers,
tim

Jon Williams

Another way to handle that bit of code is with a FOR-NEXT loop.· Note, too, that you should initialize servo outputs low before using PUSLOUT:

Servo··· PIN··· 0

pulse··· VAR··· Word

Setup:
· LOW Servo

Main:
· FOR pulse = 500 TO 1000 STEP 20
··· PULSOUT Servo, pulse
··· PAUSE 20
· NEXT




▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
Jon Williams
Applications Engineer, Parallax