View Full Version : Hobby servo motor precision?

04-10-2011, 07:50 PM
I have a ranging sensor mounted on a HiTec HS-311 servo. I have done some programming to take readings every 5 degrees using Arduino's Servo library. My question is, does the servo precisely orient to 15 deg when i ask it to? Because from what i've seen, 0 deg doesn't at all seem like 0 deg. Also 180 deg doesn't at all seem like 180 deg. Only 90deg seems precise.

04-11-2011, 01:07 PM
The precision of a servo depends on it's electronics. Most servo's use a simple potentiometer for feedback, so they are not usually completely linear. Most also have a certain amount of play in the gears, and accuracy goes down with age.Also the driving PWM plays a factor too. And repeated twice the same angle will not be the same exactly due to errors due the above mentioned factors.

You can improve it though

Or adding other form of external feedback.