![]() Both the MG90S and the SG90 are wired the same and use similar code. The MG90S is also slightly faster than the SG90, which is a further justification for why it is used here. The MG90S is another small servo motor that is similar to the SG90, but weighs slightly more (14g) and has metal gears instead of plastic. The goal of this project is to introduce users into the workings of a servo motor, how PWM (pulse-width modulation) controls a servo motor, and how Arduino can interface with servo motors to produce desired movements to great precision. The basics and composition of an SG90 will be explored, and the application of several servo codes and applications will be given for another type of servo motor, the MG90S. In this tutorial, an Arduino board will be used to power and control a small servo motor. Lastly, servo motors use a circuit to control and send feedback information to a given controller, which in our case is an Arduino board (read more about servo motors here). Often, servo motors contain a series of gears that either speed up or slow down and smooth the movement of the DC motor. The low-cost servos that are found in maker projects use potentiometers to register voltages as positions on the rotating plane of the servo. ![]() Servo motors are often comprised of DC motors that use feedback mechanisms to move with great precision from one position to another. Therefore, if your servo motor is not turning to the full range of motion which you expect, try either reducing the minimum or increasing the maximum pulse width in microseconds using the servo.attach(pin,min,max) function.Servo motors can be found in robotic arms, cameras, lathes, CNC machines, printing presses, and other engineering applications where precision and repeated movement are required. In fact, in my experience, even within the same make and model of servo motors, these max and min pulse widths differs slightly as well. However, these values are not always true for every make and model of the servo motor you bought. We can see that the minimum pulse width that corresponds to the 0 ° position defaults to 544, while the maximum pulse width that corresponds to the 180 ° position defaults to 2400. Max (optional): the pulse width, in microseconds, corresponding to the maximum (180-degree) angle on the servo (defaults to 2400) Min (optional): the pulse width, in microseconds, corresponding to the minimum (0-degree) angle on the servo (defaults to 544) Pin: the number of the pin that the servo is attached to attach() function, we see the following: Syntax The Servo library allows us to easily control the motor position in degrees by converting the degrees we specify into the microseconds of the pulse width required to "tell" the servo motor which angle to turn to. Step 3: Calibrating the ServoĪ servo motor uses pulse width modulation (PWM) to understand which position the servo motor should turn to. Find out more hereĪnd thats all the code you need to control the servo however you want! However, if your realized that your servo motor is not rotating the full range of motion of 180 °, you might need to calibrate your servo at the next step. servoMotor.write(0) : Sends a signal to the motor to go to the 0 ° position. ![]() servoMotor.attach(servoPin) : Tells the library which output pin on the Arduino to associate with the servoMotor object. ![]()
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