Servo Motor Control

Two examples for connecting:

1) a classic servor motor to Arduino

2) a stronger servo motor, the Dynamixel AX-12A, to Arduino

Example 1: Servo Motor Basics with Arduino

https://docs.arduino.cc/learn/electronics/servo-motors

Example 2: Using Dynamixel AX-12A Servo with Arduino

https://www.youtube.com/watch?v=JQSY8jlgW90

Wiring Diagram

AX-12A pin1: GND ---> DC -12V

AX-12A pin2: VDD ---> DC +12V

AX-12A pin3: DATA ---> Tx pin of Arduino

• • • Connect the two grounds together ***

pinout diagram: https://github.com/makertut/ax12-arduino

Arduino Library

Download ZIP and install this library in Arduino:

Ax-12A Library https://github.com/jumejume1/AX-12A-servo-library

Code Example

/*
 * Example showing how to send position commands to AX-12A
 */

#include "Arduino.h"
#include "AX12A.h"

#define DirectionPin   (10u)
#define BaudRate      (1000000ul)
#define ID        (1u)

int initial_pos = 512;
int max = initial_pos + 350;
int min = initial_pos - 350;

int pos = initial_pos;
int delta = 1;

void setup()
{
  ax12a.begin(BaudRate, DirectionPin, &Serial);
}

void loop()
{
  pos = pos + delta;

  if (pos > max)
  {
    pos = max;
    delta *= -1;
  }

  if (pos < min)
  {
    pos = min;
    delta *= -1;
  }

  ax12a.move(ID, pos);
  delay(20);
}