Servo Motor Micro SG90 360 Degree Continuous Rotation

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The SG90 360° Continuous Rotation Micro Servo Motor is a versatile and compact solution for robotics and automation projects. Unlike traditional servos that rotate to a fixed angle, this servo provides continuous rotation in both directions, functioning like a geared DC motor with an integrated motor controller. Its lightweight nylon gear construction ensures smooth operation, while the PWM control allows you to start, stop, and adjust direction with ease. With a nominal speed of 120 RPM at 5V and compatibility with Arduino using the Servo.h library, this motor is perfect for driving small robot wheels or rotating components in tight spaces. However, it requires an external 5V 3A power supply, as it cannot be powered directly from an Arduino board.

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Product Images are shown for illustrative purposes only and may differ from the actual product.

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Features:

1. 360° continuous shaft rotation for versatile movement control.

2. Built-in motor controller with PWM speed and direction adjustment.

3. Lightweight, durable nylon gear system for smooth operation.

4. Nominal rotation speed of 120 RPM at 5V with slower speed capability.

5. Compatible with Arduino Servo.h library for easy coding and control.

6. Compact and space-saving design ideal for micro-robotics applications.

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Applications:

1. Driving wheels on micro-robots and small robotic vehicles.

2. DIY automation projects requiring continuous rotation.

3. Educational robotics kits for learning servo and PWM control.

4. Rotating platforms, turntables, or simple pan/tilt mechanisms.

5. Compact hobby projects where space and weight are limited.

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Please allow 5% measuring deviation due to manual measurement.

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Documentation:

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Motor Connections

The built-in cable has a 3-pin female connector that is usually mated with a male header.

1×3 Female Connector

Brown = Ground

Red = 5V

Orange = PWM Signal

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OUR EVALUATION RESULTS:

These servos are fairly strong little motors.

The servo runs on 5V with a current draw about 10mA at idle and 110mA to 250mA when being commanded to move depending on how it is being operated.  Current draw can get up to a maximum of 300mA under a stall condition, so be aware of that.  One SG90 can typically be driven off the power pin of an Arduino when experimenting as long as you don’t stall it, but motors in general are electrically noisy and power hungry devices.  It is always better to drive them directly off of a power supply rather than trying to power from the on-board MCU regulator whenever possible

If you do decide to run it directly off the MCU, you can help avoid most problems by running the power and ground from the MCU over to a breadboard and then to the servo.  By placing a fairly large electrolytic cap of around 470-1000uF across the power and ground on the breadboard, that will help to insulate the MCU from some of the power surges of the motor.

The program below can be used to exercise a 360 degree servo motor.  It simply spins the servo in one direction for 3 seconds, pauses and the spins in the opposite direction for 3 seconds.

To use, hookup 5V and ground to the servo power and ground pins.  Connect the PWM pin to pin 9 on the MCU, but this can be changed to any PWM capable pin.

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Package Includes:

1 x Servo Motor Micro SG90 360 Degree Continuous Rotation

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Servo Motor Micro SG90 360 Degree Test Program

/*
  Exercise 360 degree Servo motor
  Simply runs servo in one direction for 2 seconds and then reverses direction
  Uses built-in Servo.h library
*/
#include "Servo.h"
#define SERVO_PIN 9   // Can use any PWM pin

Servo servo;          // creates servo object used to control the servo motor
//===============================================================================
//  Initialization
//===============================================================================
void setup()
{
  servo.attach(SERVO_PIN); // assigns PWM pin to the servo object
}
//===============================================================================
//  Main
//===============================================================================
void loop()
{
  servo.write(0); //Spin in one direction
  delay(3000);
  servo.write(90); // Stop
  delay(500);
  servo.write(180);  // Spin in opposite direction
  delay(3000);
  servo.write(90);  // Stop
  delay(500);
}