MotorRunCode

void run_()     // ahead
{
  digitalWrite(Left_motor_go,HIGH);  // set left motor go ahead
  digitalWrite(Left_motor_back,LOW);
  digitalWrite(Right_motor_go,HIGH);  // right motor go ahead
  digitalWrite(Right_motor_back,LOW);
  analogWrite(Left_motor_en,157); // set motor speed
  analogWrite(Right_motor_en,200);//PWM--Pulse Width Modulation(0~255). right motor go speed is 255.
  delay(100);// Set motor run time
  analogWrite(Left_motor_en,0); // set motor speed to zero
  analogWrite(Right_motor_en,0);// set motor speed to zero
}