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Inexpensive 180 degree metal gear servo — Parallax Forums

Inexpensive 180 degree metal gear servo

Ron CzapalaRon Czapala Posts: 2,418
edited 2012-12-08 17:38 in General Discussion
http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=27725

I just got some nice Turnigy 180 degree servos from HobbyKing for $4.57 each.

Shipping was about 2 weeks.

Turnigy metal gear analog mini servo with 180 degree stop to stop movement.
180 degree rotation is perfect for pan and tilt camera mounts or any other articulated application. This servo also offers good torque, speed, excellent centering and a great price!
The gear train is all metal.

Specs:
Weight: 12g
Size: 23.2mmx12.0mmx21.6mm
Torque: 2.0kg.cm (6.0v)
Speed: 0.12sec/60deg (4.8v) - 0.10 sec/60deg (6.0v)
Voltage: 4.8-6.0v
Type: Analog Micro
Gear Train: Metal
Ball Bearing: No
Lead Length: 180mm
Plug: JR/Futaba

Comments

  • ercoerco Posts: 20,257
    edited 2012-12-07 11:48
    Nice servo and a good price. Two week shipping is faster than I get in LA, I usually have to wait 3-4 weeks.
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-12-07 18:42
    Nice find. The little 900HXT servos have 180 degree range and I'd often wished for a larger inexpensive servo with the same range.

    Thanks for posting.

    I once used HobbyKing faster shipping service (IIRC "EMS"). With the faster method the shipping was less than a week. It's usually about three weeks for me.
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2012-12-07 18:59
    I'm confused...

    I have some of the Hextronik HXT900 but only got 90 degrees which is why I searched for 180 degree ones. (they are the same physical size).
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-12-07 19:11
    Ron Czapala wrote: »
    I'm confused...

    I have some of the Hextronik HXT900 but only got 90 degrees which is why I searched for 180 degree ones. (they are the same physical size).

    These guys?

    0662(4).jpg


    Edit: I just noticed the servos you linked to are also micro servos.

    Have you tried pulses outside the normal 1000us to 2000us range?

    I think both erco and I have videos on the forum showing these servo move just over 180 degrees. I can probably find at least one of these videos if you're interested.
    0662(4).jpg
    565 x 414 - 57K
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2012-12-07 20:03
    Yep - erco was the one who recommended the HXT900s

    Duane, I tested them using a BS2 and I get 180 with the Turnigy and 90 with the HXT900
    '{$STAMP BS2}
'{$PBASIC 2.5}


minval CON 300
maxval CON 1200
stepval CON 50
x VAR Word
y VAR Word
servo PIN 0
here:
FOR y=minval TO maxval STEP stepval
' DEBUG CLS, DEC y,CR
    PULSOUT servo,y
    PAUSE 20
NEXT
PAUSE 1000
FOR y=maxval TO minval STEP stepval
'  DEBUG CLS, DEC y,CR
    PULSOUT servo,y
    PAUSE 20
NEXT
PAUSE 1000
GOTO here
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-12-07 20:30
    You can see the 180 degree motion in my QuickStart servo tester video (starting around 3:05).

    In the video, I'm using 300us and 3000us as endpoints.

    Here's another video showing the range of motion of the HXT900 servos. I dont' think I had the endpoints set at the absolute extremes since I was trying to get smooth motion from the servos. They look like they are turning just under 180 degrees.
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2012-12-08 17:01
    I've never used a servo with the propeller yet - looks like you have more capabilities/flexibility than with a BS2.

    The BS2 does easily drive this Turnigy 180 degrees using the PULSOUT command (see code in post #6)
  • Duane DegnDuane Degn Posts: 10,588
    edited 2012-12-08 17:13
    Ron,

    With a HXT900 hooked up to your BS2, try having your "y" go from 150 to 1500 instead of 475 and 1000.

    This should be about the same as my 300us to 3000us pulses. I wouldn't try it on your metal gear servo. It might over drive it.

    Do you have a QuickStart board? If so try out my servo tester program. I included some instructions to post #2 (IIRC) of the thread. It will let you change the end points on the fly.
  • Ron CzapalaRon Czapala Posts: 2,418
    edited 2012-12-08 17:38
    Duane Degn wrote: »
    Ron,

    With a HXT900 hooked up to your BS2, try having your "y" go from 150 to 1500 instead of 475 and 1000.

    This should be about the same as my 300us to 3000us pulses. I wouldn't try it on your metal gear servo. It might over drive it.

    Do you have a QuickStart board? If so try out my servo tester program. I included some instructions to post #2 (IIRC) of the thread. It will let you change the end points on the fly.

    I played around with the values and ranging from 300 to 1200 gives me pretty close to a 180 degree sweep with the HXT900.
    Thanks for the suggestions.

    Don't have a QuickStart board - need to get one someday - the touch buttons would be handy...

    - Ron
    '{$STAMP BS2}
'{$PBASIC 2.5}


minval CON 300
maxval CON 1200
stepval CON 50
x VAR Word
y VAR Word
servo PIN 0
here:
FOR y=minval TO maxval STEP stepval
' DEBUG CLS, DEC y,CR
    PULSOUT servo,y
    PAUSE 20
NEXT
PAUSE 1000
FOR y=maxval TO minval STEP stepval
'  DEBUG CLS, DEC y,CR
    PULSOUT servo,y
    PAUSE 20
NEXT
PAUSE 1000
GOTO here
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