Servo MG90S with metal gear

MG90S servo with metal gear is widely used in car models to control the rotation of the front wheels, in aircraft modeling to rotate the rudder and flaps of the model. In the era of the heyday of technical creativity in the Soviet Union, the name steering machine was assigned to the device of this class. The MG90S servo drive is used to rotate parts of various mechanisms. Thanks to the metal gear reducer, the output shaft develops a force sufficient for use in mobile robots. The low speed of rotation of the shaft allows you to more accurately obtain the desired angle of rotation.

Inside the case is a small control module, which, under the influence of an input signal, supplies power of the appropriate polarity to the electric motor. The input control signal contains the required shaft position. To determine the current position of the shaft, the gearbox is connected to a position sensor. The MG90S electronics calculate the difference between the current gearbox position and the desired one. The control module, focusing on the position sensor, supplies power of the required polarity to the motor to rotate the gearbox, bringing the position transmitted by the control signal and the current one into line.
Information about the required position of the shaft is contained in the duty cycle of the control signal pulses. The frequency of the control signal must be constant and equal to 50 Hz. Duty cycle - the ratio of the pulse duration to the period. More often, when analyzing the parameters of the control signal, the duration of the pulse is considered. To form such a signal, it is convenient to use a microcontroller with the function of pulse-width modulation of the output signal.

When working on projects based on the Arduino controller, when programming the MK, a special software library of Servo functions is used.

Servo connection pinout:
Brownpower minus
Redplus nutrition
Orangecontrol

Specifications:
Gear Material: Metal
Servo Type: Digital
Supply voltage: 4.8V
Rotation angle: 180°
Turn Speed: 0.1sec/60° @ 4.8V
Shaft force: 1.8/cm @ 4.8V
Dimensions: 22 x 12 x 28 mm