سروو موتور SG90

The SG90 9g servo motor allows precise angular position control from 0° to 180° using a PWM signal.
It includes three arms and three screws and a cable of up to 25 cm.
They are used in a wide variety of electronics, robotics, remote-controlled car, aircraft, and other projects. They work with most microcontroller control boards, such as Arduino, Nodemcu, ESP32, PIC, Raspberry Pi, and other boards.
SPECIFICATIONS AND FEATURES
Model: SG90
Working voltage: 4.8V
Color: Blue
Size: 22.8mm x 12.3mm x 22.5mm
Degrees / Maximum Rotation Angle: 0° to 180°
Gears: Nylon
Working temperature: -30 to +60 °C
Applications
It is used as actuator for many robots like Biped Robot, Hexapod, Robotic Arm etc.
Commonly used for steering system in RC toys
Robots where position control without feedback is required
Therefore, less weight is used in robots with multiple DOF such as humanoid robots.

Example
Controlling servos on Arduino is very simple, since the Standard IDE provides the “servo.h” library, which allows you to simultaneously control up to 12 servos on Arduino Uno/Nano and up to 48 servos on Arduino Mega.
Among the typical examples to illustrate the operation of servos we have the Sketch “Sweep”, which performs a continuous sweep with the servo.
To do this, it increases the angle from 0 to 180º at a rate of 1º every 15ms, then performs the opposite operation from 180º to 0º, to finally restart the loop.

#include <Servo.h>

Servo myservo;  // crea el objeto servo

int pos = 0;    // posicion del servo

void setup() {
  myservo.attach(9);  // vincula el servo al pin digital 9
}

void loop() {
  //varia la posicion de 0 a 180, con esperas de 15ms
  for (pos = 0; pos <= 180; pos += 1) 
  {
    myservo.write(pos);              
    delay(15);                       
  }

  //varia la posicion de 180 a 0, con esperas de 15ms
  for (pos = 180; pos >= 0; pos -= 1) 
  {
    myservo.write(pos);              
    delay(15);                       
  }
}