This board Integrates a half duplex circuit inside. That means the transmit wire from your UART is connected to all of the AX-12 servos. Hence: when you send a command over the wire then all of the servos will hear it - but because the message contains the destination servo ID then only one servo, matching that ID number, will process it.

Because of the servo can be linked by serial bus, which can connect up to 200+ servos. Each unit can feedback its position, rotation velocity, torque, current, motor temperature and so on.It can do rotating all round, and the velocity can be controlled, just act as a gear motor. This feature enables it to work as a motor of wheeled robots, or tracked robots.



Pin Out

Digital Servo Shield for Ardhuino_PinOut

More Details

Connection Diagram

Digital Servo Shield for Ardhuino_Diagram

Sample Code

 # This Sample code is to test the Digital Servo Shield.
 # Editor : Leff
 # Date   : 2016-1-19
 # Ver    : 1.1
 # Product: Digital Servo Shield for Arduino

 # Hardwares:
 1. Arduino UNO
 2. Digital Servo Shield for Arduino
 3. Digital Servos( Compatible with AX-12,CDS55xx...etc)
 4. Power supply:6.5 - 12V

 # How to use:
 If you don't know your Servo ID number, please
 1. Open the serial monitor, and choose NewLine,115200
 2. Send command:'d',when it's finished, please close the monitor and re-open it
 3. Send the command according to the function //controlServo()//

#include <SPI.h>
#include <ServoCds55.h>
ServoCds55 myservo;

int servoNum = 1;
char inputCommand ;         // a string to hold incoming data
boolean inputComplete = false;

void setup () {
  Serial.begin (115200);
  myservo.begin ();

void loop () {
  if (inputComplete) {
    Serial.print("Your command is: "); Serial.println(inputCommand); Serial.println("");
    // clear the command:
    inputCommand = 0;
    inputComplete = false;

void serialEvent() {
  while (Serial.available()) {
    char inChar = (char);
    if (inChar == '\n') {
      inputComplete = true;
    inputCommand += inChar;

void controlServo(char val) {
  switch (val) {
    case 'p':
      myservo.write(servoNum, 300); //ID:1  Pos:300  velocity:150
      myservo.write(servoNum, 0); //ID:1  Pos:0  velocity:150
    case 'v':
      myservo.setVelocity(200);// set velocity to 100(range:0-300) in Servo mode
    case 'm':
      myservo.rotate(servoNum, 150); //   Anti CW    ID:1  Velocity: 150_middle velocity  300_max
      myservo.rotate(servoNum, -150); //  CW     ID:1  Velocity: -150_middle velocity  -300_max
      myservo.rotate(servoNum, 0); //Stop
      myservo.Reset(servoNum);    //Only Dynamixel AX need this instruction while changing working mode
      //CDS55xx don't need this, it can switch freely between its working mode
    case 'r':
      myservo.Reset(servoNum);//Restore ID2 servo to factory Settings ( ID:1  Baud rate:1000000)
    //        case 'i':
    //        myservo.SetID(2,1);//ID:1   newID:2
    //        break;
    case 'd':  //Reset servo to ID>>servoNum. If you don't know your Servo ID, please send "d".
      Serial.print("Please wait..");
      for (int buf = 0; buf < 255; buf++) {
        myservo.SetID(buf, servoNum);
        if (buf % 50 == 0) Serial.print(".");
      Serial.println("");   Serial.println("Please close the monitor and re-open it to play your servo! ");
      Serial.println("Please give me an available instruction:");
      Serial.println("  Servo mode: p_Set position; v_Set velocity.");
      Serial.println("  Motor mode: m_Rotate; v_Set velocity.");
      Serial.println("  Others: r_Reset servo to factory settings; i_Change servo ID."); Serial.println("");

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More Documents

DFshopping_car1.png Get Smart Arduino Digital Servo Shield for Dynamixel AX from DFRobot Store or DFRobot Distributor.

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