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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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  • Tough one. Usually a futaba continuous servo has a teeny tiny zero adjust pot , that's the most obvious thing to try to make it perfect. It still may drift depending on temperature or just in jostling it around.

    Fyi - Zero speed is 1.5 ms pulse width every 20 ms. I'm not sure how the servo library handles multiple servos, could be arduino pwm accuracy, but also could be the servo itself drifting and offset. A mosfet could be put upstream to cut all servo power. I'm not sure what happens if pulse width goes to zero. 

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  • Tough one. Usually a futaba continuous servo has a teeny tiny zero adjust pot , that's the most obvious thing to try to make it perfect. It still may drift depending on temperature or just in jostling it around.

    Fyi - Zero speed is 1.5 ms pulse width every 20 ms. I'm not sure how the servo library handles multiple servos, could be arduino pwm accuracy, but also could be the servo itself drifting and offset. A mosfet could be put upstream to cut all servo power. I'm not sure what happens if pulse width goes to zero. 

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