String command;
#define stepPin 4
#define dirPin 3 
void setup() {
    Serial.begin(9600); 
    Serial.println("Please entre location (A/B/C)");
}
 
void loop() {
    if(Serial.available()){
        command = Serial.readStringUntil('\n');
         
        if(command.equals("A"))
        {
             digitalWrite(dirPin,HIGH); // Enables the motor to move in a particular direction
              // Makes 200 pulses for making one full cycle rotation
             for(int x = 0; x < 400; x++) 
             {
              digitalWrite(stepPin,HIGH); 
               delayMicroseconds(500);    // by changing this time delay between the steps we can change the rotation speed
               digitalWrite(stepPin,LOW); 
               delayMicroseconds(500); 
               
               
            }   
            
        }
       
        else if(command.equals("B"))
             {
             digitalWrite(dirPin,HIGH); // Enables the motor to move in a particular direction
              // Makes 200 pulses for making one full cycle rotation
             for(int x = 0; x < 800; x++) 
             {
              digitalWrite(stepPin,HIGH); 
               delayMicroseconds(500);    // by changing this time delay between the steps we can change the rotation speed
               digitalWrite(stepPin,LOW); 
               delayMicroseconds(500); 
    
             } 
             }  
        else if(command.equals("C"))
             {
             digitalWrite(dirPin,HIGH); // Enables the motor to move in a particular direction
              // Makes 200 pulses for making one full cycle rotation
             for(int x = 0; x < 1200; x++) 
             {
              digitalWrite(stepPin,HIGH); 
               delayMicroseconds(500);    // by changing this time delay between the steps we can change the rotation speed
               digitalWrite(stepPin,LOW); 
               delayMicroseconds(500); 
    
             } 
             }  
            










        }
        
        
}