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2.12 Servo

Overview

In this lesson, you will learn something about Servo. Servo is a kind of driver whose position (angular) can be adjustable and kept or a rotary actuator that allows for precise control of angular position. Currently, it is widely used in upscale remote control toys, such as airplane, submarine, telerobot and so on.

Components Required

Fritzing Circuit

In this example, we use PWM pin 9 to drive the Servo, and get the orange wire of the servo connected to the PWM pin 9, the red one to 5V, and the brown one to GND.

Schematic Diagram

Code

Note

You can open the file 2.12_servo.ino under the path of sunfounder_vincent_kit_for_arduino\code\2.12_servo directly.
Or copy this code into Arduino IDE.

Once you finish uploading the codes to the Mega2560 board, you can see the servo arm rotating in the range 0°~180°.

Code Analysis

By calling the library Servo.h, you can drive the servo easily.

#include <Servo.h>

Library Functions：

Servo

Create Servo object to control a servo.

uint8_t attach(int pin);

Turn a pin into a servo driver. Calls pinMode. Returns 0 on failure.

void detach();

Release a pin from servo driving.

void write(int value);

Set the angle of the servo in degrees, 0 to 180.

int read();

Return that value set with the last write().

bool attached();

Return 1 if the servo is currently attached.