Technical, Techniques, Hints, and Tips > The "Black Arts!" ( Electrics & Electronics )
Operating servos that rotate 180 degrees
roycv:
Hi all, I am looking for help here.
I have bought servos advertised as 180 degree type expecting them to work on my (old) standard Tx. They just give 90 degree rotation.
On checking the spec of the servos more carefully I see that I have to have a Tx able to give a wider pulse of 500 - 2500 micro secs. (0.5 - 2.5 milli secs) instead of the standard one of 1 -2 milli secs.
Years ago I used to open up a servo and add resistors to the feedback pot to give a wider angle of travel. My eyesight is not quite up to that now. But happy to open up a Tx.
Is there something similar I can do in the transmitter?
regards
Roy
derekwarner:
Hullo Roy, not in the gizzards of the the onboard servo, nor the Tx, ..but the ACTion P96 servomorph [of Dave Milborn fame] installed in your vessel from Component Shop will possibly resolve your need
From Zero to ~~160 degrees of movement.....individual set point adjustable & with speed control........they are magnificent...... I have [3]...yes three of them
[I will get them commissioned one day .......I am not using them in servo stretch mode, but to actually reduce each servo end point to point and most importantly the servo slow function.....one each for Rudder, Stephenson's reversing gear linkage & Steam Regulator]
So if any nincompoop slammed <*< any Tx stick in any direction, the P96 onboard takes over the function O0 & gently gently does it :kiss:...it also saves the owner from trying to achieve a gently...gently by hand attempt in moving the Tx stick
Derek
https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=2ahUKEwiM1emq5pPdAhXKFYgKHQZ0CXQQFjAAegQIChAB&url=https%3A%2F%2Fwww.componentshop.co.uk%2Fp96-servomorph.html&usg=AOvVaw1K-GSfER1L3OOtChAXcS7U
afb:
This unit also addresses 180 degree capability in servos with individually set end points and adjustable speed. My experience is that the servo horn will need re-fitting from the 1.5mSec centre position as 180 degrees is typically achieved with an asymmetric setting of eg +100, -80 degrees.
http://www.forge-electronics.co.uk/index.php/boats/servo-controller
john44:
As Derek says action servo-morph, easy to set and reliable..
John
BrianB6:
--- Quote from: john44 on August 30, 2018, 09:27:27 am ---As Derek says action servo-morph, easy to set and reliable..
John
--- End quote ---
But only about 160 degrees which may not be enough if you want a full 180
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