Arduino_Stepmotor_Full_Step1

int motorPin1 = 8;// Blue   - 28BYJ48 pin 1
int motorPin2 = 9;// Pink   - 28BYJ48 pin 2
int motorPin3 = 10;// Yellow - 28BYJ48 pin 3
int motorPin4 = 11;// Orange - 28BYJ48 pin 4
int motorSpeed = 4;     //variable to set stepper speed
char val = '0';
void setup() {
  //declare the motor pins as outputs
  pinMode(motorPin1, OUTPUT);
  pinMode(motorPin2, OUTPUT);
  pinMode(motorPin3, OUTPUT);
  pinMode(motorPin4, OUTPUT);
  Serial.begin(9600);
}
void loop(){
 if (Serial.available()> 0)
  {
    val = Serial.read();
    Serial.println(val);
  }
  if (val == '1'){        
counterclockwise();   //หมุนวนขวา
  }
    if (val == '2'){
       clockwise();  //หมุนวนซ้าย
  }             
    if (val == '0'){ //หยุดหมุน
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, LOW);
  }      
}
void counterclockwise (){
  // 1
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, LOW);
  delay(motorSpeed);
  // 2
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, LOW);
  delay (motorSpeed);
  // 3
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay(motorSpeed);
  // 4
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorSpeed);
}
void clockwise(){
 // 1
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, HIGH);
  delay(motorSpeed);
  // 2
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, HIGH);
  digitalWrite(motorPin4, LOW);
  delay (motorSpeed);
  // 3
  digitalWrite(motorPin1, LOW);
  digitalWrite(motorPin2, HIGH);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, LOW);
  delay(motorSpeed);
  // 4
  digitalWrite(motorPin1, HIGH);
  digitalWrite(motorPin2, LOW);
  digitalWrite(motorPin3, LOW);
  digitalWrite(motorPin4, LOW);
  delay(motorSpeed);
}