#include <LiquidCrystal.h>
              // RS  EN D4 D5 D6 D7
LiquidCrystal lcd(13, 12, 11, 10, 9, 8);
int so = 12; int dat = 30;
void setup() 
{
  lcd.begin(16, 2);
  lcd.print("Nhiet do dat:");
  lcd.print(dat);

  lcd.setCursor(5, 1);
  so = analogRead(A15);
  lcd.print(so);
  pinMode(21, OUTPUT);
}

void loop() 
{
  lcd.setCursor(0, 1);
  lcd.print("Nhiet do do:");
  so = analogRead(A15);
  so = map(so, 0, 1023, 0, 100);
  lcd.print(so);
  lcd.print("   ");
  //if (so > dat):
  //  {digitalWrite(21, HIGH);}
  //else:
   // {digitalWrite(21,LOW);}
}