Servo¶

Overview¶

In this lesson, you will explore the use of Arduino and Servo Motors. Focusing on the Arduino Uno and the SG90 servo motor, you’ll learn how to program the Arduino to control the servo’s sweeping motion. This technique is essential in various applications like robotics and automated systems.

Required Components¶

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Elite Explorer Kit	300+	Elite Explorer Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION	PURCHASE LINK
Arduino Uno R4 WiFi	-
Jumper Wires	BUY
Servo	BUY

Wiring¶

Schematic Diagram¶

Code¶

Note

You can open the file 27-servo.ino under the path of elite-explorer-kit-main\basic_project\27-servo directly.
Or copy this code into Arduino IDE.

Code Analysis¶

Here, the Servo library is included which allows for easy control of the servo motor. The pin connected to the servo and the initial angle of the servo are also defined.

#include <Servo.h>
const int servoPin = 9;  // Define the servo pin
int angle = 0;           // Initialize the angle variable to 0 degrees
Servo servo;             // Create a servo object

The setup() function runs once when the Arduino starts. The servo is attached to the defined pin using the attach() function.
```
void setup() {
  servo.attach(servoPin);
}
```
The main loop has two for loops. The first loop increases the angle from 0 to 180 degrees, and the second loop decreases the angle from 180 to 0 degrees. The servo.write(angle) command sets the servo to the specified angle. The delay(15) causes the servo to wait for 15 milliseconds before moving to the next angle, controlling the speed of the scanning movement.
```
void loop() {
  // scan from 0 to 180 degrees
  for (angle = 0; angle < 180; angle++) {
    servo.write(angle);
    delay(15);
  }
  // now scan back from 180 to 0 degrees
  for (angle = 180; angle > 0; angle--) {
    servo.write(angle);
    delay(15);
  }
}
```