[PD] stepper message syntax (pd through arduino)

ad alejoduque at gmail.com
Tue Oct 3 00:39:02 CEST 2006

On Oct 2, 2006, at 4:55 PM, <martin.peach at sympatico.ca>  
<martin.peach at sympatico.ca> wrote:
> there are four messages that you sequence. With a slider it could  
> increment or decrement a counter that goes to  a select that sends  
> one of four messages to the arduino. That will work if you move the  
> slider very slowly to avoid missed values.

i have tried with few metros banging the 4 pins of the arduino  
8,9,10,11that "control" the stepper. Its been just random moves from  
the stepper, i've read page 99 onwards of the document you suggested  
but i just dont seem to know how to create the correct patterns in  
pd, the stepper jumps in very small number of jumps then backwards  
then onwards... this is sending a pulse with a [metro 100]..

On Oct 2, 2006, at 4:58 PM, Kyle Klipowicz wrote:
> You could probably just set the slider to control a metro that bangs
> the proper message sequence.  This would effectively adjust the motor
> speed.

took me a while to find the bytemask and debytemask objects/patches..  
that should be included with the pduino release since the arduino- 
test.pd patch needs them... (linux 0.3.9 extended test 2 here)..  
after digging the list archives i finally found them (http:// 
lists.puredata.info/pipermail/pd-list/2006-06/039287.html), i thought  
they will stop the jittering produced by the different bang  
secuences.. nogo... the jumps are to few to be able to understand the  
right secuence.

On Oct 2, 2006, at 5:11 PM, Christian Klippel wrote:
> my idea would be the following:
> if it cant do already, change the arduino firmware to accept a byte  
> that gets
> send to a arduino port. usually, you need 4 bits for a stepper,  
> depending on
> the type. so you can mask away the unused 4 bits, and set the port- 
> lines at
> once directly. this will give you a much smoother operation of the  
> stepper as
> well.

how to know if the pduino firmware, as you said, already do this? as  
said above i've banging each pin in all kinds of combinations, the  
stepper moves but i dont seem to find a clear pattern that help me  
decipher the rest.

any other idea for a patch to get a hold on a stepper from pd using  
the pduino? i thought this was easy or was already done from pd..

tx all for the help,

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