[NSRCA-discussion] Servo Signals

[Richard Lewis]

And....Interestingly enough.....It does not matter what kind of fancy whopping digital super latest and greatest TX/RX system you have, the signals to the servos are still firmly rooted in good old 1970's technology....:)  And...Your super whopper digital brushless whatever servo still has an analog pot for position feedback....:)

I for one am eager to see a leap in servo technology.....Bidirectional serial comms to the servos with the servo being able to feed back torque, amps, position, rate, etc.....and encoder/resolver position feedback in the servos to really catch up with the world we live in......

Richard 




________________________________
From: Richard Lewis <humptybump at sbcglobal.net>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, June 20, 2009 7:51:32 PM
Subject: Re: [NSRCA-discussion] Servo Signals


More accurately it is a pulse position signal.  The RX sends a beginning pulse that the RX recognizes and then a position pulse at a later time.  The time between the start pulse and the position pulse is the absolute position that the servo is commanded to move to.

Link to a tutorial:

http://www.hooked-on-rc-airplanes.com/servo-tutorial.html

Richard




________________________________
From: Ed White <edvwhite at yahoo.com>
To: General pattern discussion <nsrca-discussion at lists.nsrca.org>
Sent: Saturday, June 20, 2009 11:52:22 AM
Subject: Re: [NSRCA-discussion] Servo Signals


Its pulse width modulation.  The pulse length varies from roughly 1.0 millisecond to 2.0 milliseconds in length, with center at roughly 1.5 msec.  For a typical radio, the pulse is repeated about 50 times per second or about once every 20 msec (though this can vary quite a lot).

Ed




________________________________
From: Jay Marshall <lightfoot at sc.rr.com>
To: nsrca-discussion at lists.nsrca.org
Sent: Saturday, June 20, 2009 10:12:24 AM
Subject: [NSRCA-discussion] Servo Signals


I’m sure everyone knows the answer to this – but me. Is the control signal sent from the receiver to the servos analog or a pulse width controlled signal?
 
Jay Marshall 
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