Stupid Question

m_fabio2

I have a question that's going to be really easy for someone people to answer, in fact it is a stupid question.
(Although a teacher of mine told me there were no stupid questions, just stupid people).

What makes a servo motor different than any other kind of motor ?
Do you vary the amount of voltage to it, and it will go from one extreme to another based on the amount of voltage going to it ?
Or do you send a serial signal to it, and it will adjust the position from that ?

I'm familiair with stepper motors, dc motors, ac induction and synchonous motors, but not servos.


I'm probably going to find out that the stuff I have been doing with stepper motors, I could have been doing with servo's alot eaier.

Newzed

A servo is controlled by a PWM signal.· If it is a continuous rotation servo, a pulse width larger than 750 will send it in on direction, a pulse width kess than 750 will send it in the opposite direction./· If you are using a BS2, a "pulsout, 800" will send out a pulse 1600us wide.· Look at "PWM" in the Help section for pulse widths for other Stamps.

If it is not a continuous rotation servo, then a pusle of 800 will send it to a·fixed position and it will stay there.· A pulse width of 500 will send it to a fixed position in the opposite direction.


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Sid Weaver
Do you have a Stamp Tester yet?
http://hometown.aol.com/newzed/index.html



Post Edited (Newzed) : 8/19/2005 11:45:51 AM GMT

Chris Savage

Hello,

·· You can get a really good explanation of how a servo works by reading our "What's A Microcontroller?" text, a free download in PDF format from our website.· The link is posted below.· If you want you can skip right to the section on servo control.· The download link is at the bottom of the page.

http://www.parallax.com/detail.asp?product_id=28123





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Chris Savage
Parallax Tech Support
csavage@parallax.com

m_fabio2

Thanks.
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