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Pololu |
SpringRC SM-S4303R Continuous Rotation Servo
Overview
The SM-S4303R is a standard-sized servo that has been built by SpringRC specifically for
continuous rotation. At 6 V, it has a maximum rotation speed of 54 RPM (no-load) and can produce
up to 71 oz-in (5.1 kg-cm) of torque. It features two ball bearings on the output shaft for reduced
friction, and it offers easy access to the rest-point adjustment potentiometer. The servo can be
controlled using a direct connection to a single microcontroller I/O line without any additional
electronics, which makes it a great actuator for beginner robotics projects.
The SM-S4303R continuous rotation servo converts standard RC servo position pulses into
continuous rotation speed. The default rest point is 1.5 ms, but this can be adjusted by using a
small slotted screwdriver to turn the middle-point positioner. Pulse widths above the rest point
result in counterclockwise rotation, with speed increasing as the pulse width increases; pulse
widths below the rest point result in clockwise rotation, with speed increasing as the pulse width
decreases.
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