#include <LiquidCrystal.h>
LiquidCrystal lcd(18,5,17,16,4,0);
int count=0,last_count=-1;
void setup() {
  Serial.begin(115200);
  Serial.println("Hello");
  lcd.begin(16,2);
  lcd.print("type in serial");
  lcd.setCursor(0,0);

}

void loop(){
  if(last_count!=count){
    last_count=count;
  
   lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("count:");
  lcd.print(count);

  }
  }

void serialEvent() {
 
 while (Serial.available()){
  char ch=Serial.read();
  Serial.print(ch);
  if(ch=='Z'){count=0;
    lcd.clear();
  }
  else if(ch=='U'){
    lcd.setCursor(0,0);count++;
  
  }
  else if(ch=='D'){
    lcd.setCursor(0,1);count--;
    
  }
 

 }
}