int serIn;

void setup() {

Serial.begin(115200);

pinMode (12,OUTPUT);
pinMode (13,OUTPUT);

}

void loop() {

if(Serial.available()) {    
    
     while (Serial.available()>0){
      
        serIn = Serial.read();  //read Serial 
        shiftOut(12,13,MSBFIRST,serIn);
                
        //Serial.print(serIn, HEX);  //prints the character just read
        
        }
    }
}