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Author Topic: Servo motor range only 90 degrees?  (Read 3779 times)
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In the text the servo motor is supposed to give 180 degree of motion, even suggesting cutting out a "half circle" to make the dial on.
My servo is only giving me 90 degree motion, which is supported by the picture on page 69 giving only a quarter circle for the dial.

Anyone know which one is supposed to be correct? or which is working for you?
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In the text the servo motor is supposed to give 180 degree of motion, even suggesting cutting out a "half circle" to make the dial on.
My servo is only giving me 90 degree motion, which is supported by the picture on page 69 giving only a quarter circle for the dial.

Anyone know which one is supposed to be correct? or which is working for you?

Not all servos can actually move a full 180 degrees, that is just an assumption the arduino servo library uses. Perhaps a link to your specific servo may shed light on the topic?

Lefty
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the servo is the one that is included in the starter kit.

on further study there is an obvious number on it that is a product code (SM-S2309S) that states movement of about 60 degrees on the data sheets, so its just incorrectly stated in the book.
next time I might actually look at the component...

Thanks
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the servo is the one that is included in the starter kit.

on further study there is an obvious number on it that is a product code (SM-S2309S) that states movement of about 60 degrees on the data sheets, so its just incorrectly stated in the book.
next time I might actually look at the component...

Thanks

Well the datasheet I found doesn't give the total travel range. http://www.servodatabase.com/servo/springrc/sm-s2309s

The spec listed:
Quote
4.8V: 0.12 sec/60°
6.0V: 0.10 sec/60°

Is a speed specification telling how many degrees it can move in so much time at what operating voltage.

The total range specification is shown as:

Quote
Rotational Range:   ? (add)

Lefty
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That's the exact model # of the servo listed on the arduino website (arduino.cc)! You can read the # on the sticker on the photo of the servo! Just look up "servo" -- there's only a couple! They list the range of movement as 180 degrees! It's right there on their site! I'm about to order one based on the assumption that it's accurate! I hope it is!
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