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Once I have set PWM to move a servo to a particular angle, is there a way to detect that the servo has finished moving? I am concerned about situations where the servo is encountering extra resistance and is struggling to reach the desired angle.

Why I need this: I want to prevent certain events from happening until the servo reaches the right angle. I also want to be able to time the servo out and report a failure if it doesn't finish.

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You should take a look at the Analog Feedback Servos.

Here is a resource : About Servos and Feedback

And if you want to modify a classical servo and get the feedback from it, here's an article about how to hack a classical one. The hack is really easy to realize and your understanding of servos will be better (as all good hacks).

Basically, an analog feedback servos (buy as-is or hacked) will allow you to read from the servo the current position.

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  • \$\begingroup\$ Why isn't this a standard feature of servos? I would expect feedback to be a common requirement. Do any suppliers other than Adafruit sell servos with feedback? \$\endgroup\$
    – mushroom
    Jan 10, 2014 at 3:41

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