- moving 2 servo at one time -

sushiandmorihiko · 2007-10-12 04:19

hello,its me again,

i wonder if i can move 2 servo together at one time eg i have this code:

FOR boom = 1200 TO 470 STEP 40
PULSOUT 2, boom
PAUSE 20
NEXT

PAUSE 200

FOR boom = 470 TO 1200 STEP 40
PULSOUT 2, boom
PAUSE 20
NEXT

PAUSE 200

FOR boom = 1200 TO 300 STEP 40
PULSOUT 3, boom
PAUSE 40
NEXT

PAUSE 200

FOR boom = 300 TO 1200 STEP 40
PULSOUT 3, boom
PAUSE 40
NEXT

PAUSE 200

conventionally,they should move step by step, after the upper part is done than it will get to the lower part. can i execute these part together so that the servo will move together too?

thanks ,people

Mike Green · 2007-10-12 04:39

Yes. You can do

FOR boom = 1200 TO 300 STEP 40
PULSOUT 2,boom
PULSOUT 3,boom
PAUSE 40
NEXT

The second loop works the same way. You can even have the two servos move differently if you
compute the two pulse widths somehow. For example, you could have the loop count represent
the percentage of movement from the beginning, then compute the two different pulse widths
from that. The loop would read FOR percent = 1 TO 100 and you'd do the computation accordingly.

sushiandmorihiko · 2007-10-12 05:40

hhhmmm,,thanks mike green but i kinda not so clear on you idea on moving the servo different direction,very different movement at the same time?

how do i do the calculation--i think it is going to be complex isnt it

thanks mike green

Mike Green · 2007-10-12 05:47

For example (in the loop shown)
PULSOUT 2,boom
PULSOUT 3,1500-boom

Bruce Bates · 2007-10-12 08:01

Again, there is a much easier way to have two R/C servos always work together, if that's your goal. Just tie the signal wire of each R/C servo to the same Stamp pin.

Regards,

Bruce Bates

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allanlane5 · 2007-10-12 14:09

Well, Bruce, it looks like he has two servo's that he wants to move in OPPOSITE directions -- using one signal wire won't let him do that.

David H. · 2007-10-12 16:56

How about seperating the booms?
It's been awhile for my program,
but would something like this work?

FOR
boom1 = 1200 TO 470 STEP 40
boom2 = 1200 TO 300 STEP 40
PULSOUT 2, boom1
PULSOUT 3, boom2
PAUSE 20
NEXT

PAUSE 200

FOR
boom1 = 470 TO 1200 STEP 40
boom2 = 300 TO 1200 STEP 40
PULSOUT 2, boom1
PULSOUT 3, boom2
PAUSE 20
NEXT

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David

There are 10 types of people in this world,...
Those that understand binary numbers, and those that don't!!!

Mike Green · 2007-10-12 16:59

David,
That's not legal PBasic. Read the section of the manual on the FOR statement.

David H. · 2007-10-12 17:07

Thanks Mike,
Like I said, it's been a little bit for me.
Just throwing out an idea.
Have a good one!!!

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David

There are 10 types of people in this world,...
Those that understand binary numbers, and those that don't!!!

D Faust · 2007-10-12 18:42

boom2 = 470
FOR boom1 = 1200 TO 470 STEP 40
boom2 = boom2 + 40
PULSOUT 2, boom1
Pulsout 3, boom2
PAUSE 20
NEXT

PAUSE 200

boom2 = 1200
FOR boom1 = 470 TO 1200 STEP 40
boom2 = boom2 - 40
PULSOUT 2, boom1
pulsout 3, boom2
PAUSE 20
NEXT

PAUSE 200

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END

allanlane5 · 2007-10-12 19:06

Or, you could do something like:

' {$STAMP BS2}
' {$PBASIC 2.5}
BoomPos1 VAR Word
BoomPos2 VAR Word
I······· VAR Word

FOR I = 0 TO 22
· BoomPos1 = 1200 - (40 * I)
· BoomPos2 = 400 + (40 * I)
· PULSOUT 2, BoomPos1
· PULSOUT 3, BoomPos2
· PAUSE 20
NEXT

FOR I = 0 TO 22
· BoomPos1 = 400 + (40 * I)
· BoomPos2 = 1200 - (40 * I)
· PULSOUT 2, BoomPos1
· PULSOUT 3, BoomPos2
· PAUSE 20
NEXT

Point being, you've got a 'starting position', an 'ending position', and some 'increment' to get you there, and a certain number of steps.· Within that framework, you have a lot of freedom.

- moving 2 servo at one time -

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