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3.7 - Swinging Servo

In this kit, in addition to LED and passive buzzer, there is also a device controlled by PWM signal, Servo.

Servo is a position (angle) servo device, which is suitable for those control systems that require constant angle changes and can be maintained. It has been widely used in high-end remote control toys, such as airplanes, submarine models, and remote control robots.

Now, try to make the servo sway!

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

PURCHASE LINK

Kepler Kit

450+

Kepler Kit

You can also buy them separately from the links below.

SN

COMPONENT INTRODUCTION

QUANTITY

PURCHASE LINK

1

Raspberry Pi Pico W

1

BUY

2

Micro USB Cable

1

3

Breadboard

1

BUY

4

Jumper Wires

Several

BUY

5

Servo

1

BUY

Schematic

sch_servo

Wiring

wiring_servo

  • Orange wire is signal and connected to GP15.

  • Red wire is VCC and connected to VBUS(5V).

  • Brown wire is GND and connected to GND.

Code

Note

  • You can open the file 3.7_swinging_servo.ino under the path of kepler-kit-main/arduino/3.7_swinging_servo.

  • Or copy this code into Arduino IDE.

  • Don’t forget to select the board(Raspberry Pi Pico) and the correct port before clicking the Upload button.

When the program is running, we can see the Servo Arm swinging back and forth from 0° to 180°.

How it works?

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.