PSC code help, anyone??

demo

Can somebody help to make this simple servo movement with PSC?



' {$STAMP BS2sx}
' {$PBASIC 2.5}


counter VAR Byte

FOR counter = 1 TO 100
PULSOUT 12, 1250
PAUSE 20
NEXT

FOR counter = 1 TO 100
PULSOUT 12, 2500
PAUSE 20
NEXT

END

Franklin

Take a look at the documentation here. www.parallax.com/detail.asp?product_id=28023 There are examples.

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- Stephen

demo

Hi Stephen, Thanks for reply.
I have all the documentation, problem is that when I try to make that same thing with PSC, servo just starts spinning and never change direction or stop.

Franklin

What code are you using.

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- Stephen

demo

Here's the code:

' {$STAMP BS2sx}
' {$PBASIC 2.5}

ch VAR Byte
pw VAR Word
ra VAR Byte
sDat CON 15
Baud CON 1021
counter VAR Byte

ra = 1
ch = 1


FOR counter = 1 TO 100
pw = 1250
SEROUT sDat, Baud+$8000,[noparse][[/noparse]"!SC", ch, ra, pw.LOWBYTE, pw.HIGHBYTE, CR]
PAUSE 20
NEXT
FOR counter = 1 TO 200
pw = 2500
SEROUT sDat, Baud+$8000,[noparse][[/noparse]"!SC", ch, ra, pw.LOWBYTE, pw.HIGHBYTE, CR]
PAUSE 20
NEXT
END

Chris Savage

Demo,

You’re treating the PSC as if it was a serial servo, but it is not. Your code is sending the command to move to one position 100 times, and then sending the command to move to another position 200 times. You don’t need to refresh the PSC every 20 mS like a servo. The PSC keeps itself refreshed. You simply send a command and when ready send another. The thing is the pulse value you are sending is outside the range of the PSC. The PSC uses values from 500 to 1000 where 750 is the center point. The values you are sending are for a BS2sx using PULSOUT directly to a servo. I hope this helps. Take care.

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Chris Savage
Parallax Tech Support

demo

Hi Chris,

It works! Thanks so much for your help!



Demo