To control a servo motor to rotate to 90 degrees (or any specific angle) using Arduino, you first need to make sure you have a suitable servo motor and a corresponding servo motor control library, such as Arduino's `Servo` library.
Below is a basic example code showing how to control a servo motor to rotate to the 90 degree position using Arduino and the `Servo` library.
First, make sure you have connected the servo motor to the Arduino and the servo motor's signal wire (usually orange or yellow wire) is connected to one of the Arduino's PWM pins (such as pin 9).
Then, you can use the following code:
//cpp
#include <Servo.h>
Servo myservo; // Create a servo object to control the servo motor
void setup() {
myservo.attach(9); // Connect the servo motor's signal wire to digital pin 9
myservo.write(90); // Make the servo motor rotate to the 90 degree position
}
void loop() {
// In this example, we don't need to do anything in loop(),
// because we just need to make the servo motor rotate to 90 degrees and hold this position.
// If you need more complex motion, such as turning to different angles,
// you can add more myservo.write() calls here.
}
In this code, the `Servo` library is included so that we can use it to control the servo motor. `myservo` is an object of the `Servo` class, and we tell it which digital pin we will use to control the servo motor by calling its `attach()` method. In this example, we chose pin 9.
The line `myservo.write(90);` tells the servo motor to turn to the 90-degree position.
Note that the 90 degrees here is relative to the servo motor's initial position or "zero position", which may vary from servo to servo.
Some servos may have a specific zero position set internally, while others may require you to set it through calibration.
If your servo does not turn to 90 degrees as expected, possible reasons include:
- Different servo models or specifications may require different signal ranges or pulse widths.
- Connection problems, check that the servo motor's power, signal, and ground wires are all connected correctly.
- Physical limitations of the servo motor or its control circuitry, for example, the mechanical structure may prevent the motor from turning to a certain angle.
Before adjusting the servo motor control code, make sure your servo motor can turn freely and nothing is blocking its movement. If the problem persists, you may need to consult the servo motor's data sheet or contact the manufacturer for more help.