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Montana Kid's Robotics Club Continuous 2 servo locomotion Is there a way to command the servo to completely stop?

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We are building an IR Arduino uno controlled (from NEC remote)  mobile robot with two servos.  Now we used the usual servo library and it worked well until we tried to stop the servo. The servo will drift ever so slightly, because the servo is updated about every 20 milliseconds, therefore it drifts and the robot at stop continues to move.  Is there a way to command the servo to completely stop?  I thought of a cutoff power rellay but maybe there's a better way

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  • Servo hunting or drift may be due to several things like load, servo position, coupling stiffness, local vibration, power fluctuations, etc. Hobby servos typically don't have adjustable loop gain or integral and derivative feedback control so other solutions are needed. Power removal, like you suggest, is one method that would work if the load doesn't cause movement. You could also try just stopping the PWM signal to the servo. Another method is to add a large capacitor to the servo motor power supply right at the servo motor. This reduces power supply fluctuations due to servo activity.

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  • Servo hunting or drift may be due to several things like load, servo position, coupling stiffness, local vibration, power fluctuations, etc. Hobby servos typically don't have adjustable loop gain or integral and derivative feedback control so other solutions are needed. Power removal, like you suggest, is one method that would work if the load doesn't cause movement. You could also try just stopping the PWM signal to the servo. Another method is to add a large capacitor to the servo motor power supply right at the servo motor. This reduces power supply fluctuations due to servo activity.

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