program for a digital servo

jaspittman

I tried to program for a digital servo and could not get it to function properly. I have included the code I used. On a slandered servo the program will rotate the servo clockwise one way hold for a few seconds and then rotate it the other way. With a hitec hs-5645mg the servo will move clockwise and then it stutters as it very slowly tries to moves counter clockwise. Any idea why.
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[noparse][[/noparse]initialization]

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reset:
LOW servo

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[noparse][[/noparse]initialization]

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Main:
counter = 0
FOR counter = 1 TO 1000
PULSOUT servo, (1000*/ pwAdj)
PAUSE 20
NEXT

FOR counter = 1 TO 1000
PULSOUT servo, (2000*/ pwAdj)
PAUSE 20
NEXT

END

Franklin

What value is pwAdj and what are you trying to acompish with your program? Could you attach your complete program?

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- Stephen

jaspittman

I was wanting to test the servo and see if it would operate like a non-digital servo.


' {$PBASIC 2.5}


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[noparse][[/noparse]I/O]

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servo PIN 8


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[noparse][[/noparse]constants]

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pwAdj CON $0080 ' pulse width adjust = .5


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[noparse][[/noparse]initialization]

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reset:
LOW servo

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[noparse][[/noparse]initialization]

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Main:
counter = 0
FOR counter = 1 TO 1000
PULSOUT servo, (1000*/ pwAdj)
PAUSE 20
NEXT

FOR counter = 1 TO 1000
PULSOUT servo, (2000*/ pwAdj)
PAUSE 20
NEXT

END

Mike Green

The "*/" operator only works for left operands from 0-255. If you want to use the actual pulse width and adjust it, use "/". In this case, pwAdj would be 2 and the expression in the PULSOUT would be 1000/pwAdj or 2000/pwAdj.