SM-S4303R PDF Datasheet – Continuous Rotation Servo Motor

A continuous rotation servo motor, also known as a “360-degree servo,” is a type of servo motor that has been modified to rotate continuously in either direction without any physical stop. Unlike standard servo motors that have a limited range of motion (usually around 180 degrees), a continuous rotation servo can rotate continuously in a full 360-degree circle.

Part Number: SM-S4303R

Function: Continuous Rotation Servo Motor

Manufacturer: Pololu

Images:SM-S4303R pdf motor


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.  […]

SM-S4303R datasheet pinout

SM-S4303R PDF Datasheet