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Code

/*
   Robotic ARM with Record and Play option using Arduino
   Code by: B. Aswinth Raj
   Website: www.circuitdigest.com
   Dated: 05-08-2018
*/

#include <Servo.h> //Servo header file

//Declare object for 5 Servo Motors 
Servo Servo_0;
Servo Servo_1;
Servo Servo_2;
Servo Servo_3;
Servo Gripper;

//Global Variable Declaration
int S0_pos, S1_pos, S2_pos, S3_pos, G_pos;
int P_S0_pos, P_S1_pos, P_S2_pos, P_S3_pos, P_G_pos;
int C_S0_pos, C_S1_pos, C_S2_pos, C_S3_pos, C_G_pos;
int POT_0,POT_1,POT_2,POT_3,POT_4;

int saved_data[700]; //Array for saving recorded data

int array_index=0;
char incoming = 0;

int action_pos;
int action_servo;

void setup() {
Serial.begin(9600); //Serial Monitor for Debugging

//Declare the pins to which the Servo Motors are connected to
Servo_0.attach(3);
Servo_1.attach(5);
Servo_2.attach(6);
Servo_3.attach(9);
Gripper.attach(10);

//Write the servo motors to initial position
Servo_0.write(70);
Servo_1.write(100);
Servo_2.write(110);
Servo_3.write(10);
Gripper.write(10);

Serial.println("Press 'R' to Record and 'P' to play"); //Instruct the user
}

void Read_POT() //Function to read the Analog value form POT and map it to Servo value
{
   POT_0 = analogRead(A0); POT_1 = analogRead(A1); POT_2 = analogRead(A2); POT_3 = analogRead(A3); POT_4 = analogRead(A4); //Read the Analog values form all five POT
   S0_pos = map(POT_0,0,1024,10,170); //Map it for 1st Servo (Base motor)
   S1_pos = map(POT_1,0,1024,10,170); //Map it for 2nd Servo (Hip motor)
   S2_pos = map(POT_2,0,1024,10,170); //Map it for 3rd Servo (Shoulder motor)
   S3_pos = map(POT_3,0,1024,10,170); //Map it for 4th Servo (Neck motor)
   G_pos  = map(POT_4,0,1024,10,170);  //Map it for 5th Servo (Gripper motor)
}

void Record() //Function to Record the movements of the Robotic Arm
{
Read_POT(); //Read the POT values  for 1st time

//Save it in a variable to compare it later
   P_S0_pos = S0_pos;
   P_S1_pos = S1_pos;
   P_S2_pos = S2_pos;
   P_S3_pos = S3_pos;
   P_G_pos  = G_pos;
  
Read_POT(); //Read the POT value for 2nd time
 
   if (P_S0_pos == S0_pos) //If 1st and 2nd value are same
   {
    Servo_0.write(S0_pos); //Control the servo
   
    if (C_S0_pos != S0_pos) //If the POT has been turned
    {
      saved_data[array_index] = S0_pos + 0; //Save the new position to the array. Zero is added for zeroth motor (for understading purpose)
      array_index++; //Increase the array index
    }
   
    C_S0_pos = S0_pos; //Saved the previous value to check if the POT has been turned
   }

//Similarly repeat for all 5 servo Motors
   if (P_S1_pos == S1_pos)
   {
    Servo_1.write(S1_pos);
   
    if (C_S1_pos != S1_pos)
    {
      saved_data[array_index] = S1_pos + 1000; //1000 is added for 1st servo motor as differentiator
      array_index++;
    }
   
    C_S1_pos = S1_pos;
   }

 if (P_S2_pos == S2_pos)
   {
    Servo_2.write(S2_pos);
   
    if (C_S2_pos != S2_pos)
    {
      saved_data[array_index] = S2_pos + 2000; //2000 is added for 2nd servo motor as differentiator
      array_index++;
    }
   
    C_S2_pos = S2_pos;
   }

   if (P_S3_pos == S3_pos)
   {
    Servo_3.write(S3_pos);
   
    if (C_S3_pos != S3_pos)
    {
      saved_data[array_index] = S3_pos + 3000; //3000 is added for 3rd servo motor as differentiater
      array_index++;
    }
   
    C_S3_pos = S3_pos;  
   }

   if (P_G_pos == G_pos)
   {
    Gripper.write(G_pos);
   
    if (C_G_pos != G_pos)
    {
      saved_data[array_index] = G_pos + 4000; //4000 is added for 4th servo motor as differentiator
      array_index++;
    }
   
    C_G_pos = G_pos;
   }
  
  //Print the value for debugging
  Serial.print(S0_pos);  Serial.print("  "); Serial.print(S1_pos); Serial.print("  "); Serial.print(S2_pos); Serial.print("  "); Serial.print(S3_pos); Serial.print("  "); Serial.println(G_pos);
  Serial.print ("Index = "); Serial.println (array_index);
  delay(100);
}

void Play() //Functon to play the recorded movements on the Robotic ARM
{
  for (int Play_action=0; Play_action<array_index; Play_action++) //Navigate through every saved element in the array
  {
    action_servo = saved_data[Play_action] / 1000; //The fist character of the array element is split for knowing the servo number
    action_pos = saved_data[Play_action] % 1000; //The last three characters of the array element is split to know the servo postion 

    switch(action_servo){ //Check which servo motor should be controlled
      case 0: //If zeroth motor
        Servo_0.write(action_pos);
      break;

      case 1://If 1st motor
        Servo_1.write(action_pos);
      break;

      case 2://If 2nd motor
        Servo_2.write(action_pos);
      break;

      case 3://If 3rd motor
        Servo_3.write(action_pos);
      break;

      case 4://If 4th motor
        Gripper.write(action_pos);
      break;
    }

    delay(50);
   
  }
}

void loop() {

if (Serial.available() > 1) //If something is received from serial monitor
{
incoming = Serial.read();
if (incoming == 'R')
Serial.println("Robotic Arm Recording Started......");
if (incoming == 'P')
Serial.println("Playing Recorded sequence");
}

if (incoming == 'R') //If user has selected Record mode
Record();

if (incoming == 'P') //If user has selected Play Mode
Play();

}