servo programming problem

dmehling

I am trying to program my basic stamp 1 to control a servo and I seem to be having trouble positioning the servo correctly. I'm trying to get the servo to move from its minimum and maximum articulation, but it doesn't want to move. It acts like it's at its limit and cannot turn in a certain direction any further and it cannot seem to go the opposite direction either. Below is a sample of the code for my program.

' {$STAMP BS1}
Main:

PULSOUT 1, 500
PAUSE 8000
PULSOUT 1, 1000
PAUSE 8000
GOTO main

Franklin

I'm not where I can look up the exact syntax but this is the idea. One pulseout will not be enough to get to the other stop. try this and adjust the pulseout numbers according to your needs.

' {$STAMP BS1}
Main:

for i = 1 to 20
PULSOUT 1, 500
PAUSE 20
next
for i = 1 to 20
PULSOUT 1, 1000
PAUSE 20
next
GOTO main

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- Stephen

Chris Savage

Hello,

The PULSOUT values you’re both specifying are for the BS2 which uses 2us increments. The BS1 however uses 10us increments and so those values are way outside the range. You should be using values from 100-200 with 150 being the center pulse value.

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Chris Savage
Parallax Tech Support

Franklin

Thanks Chris, I was just copying dmehlings code as when I do any coding I have to look these things up every time.

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- Stephen