#include <LiquidCrystal.h>

LiquidCrystal lcd(12,11,4,5,6,7);

int analogInPin=A0;

void setup() {

? // put your setup code here, to run once:

? lcd.begin(16,2);

? lcd.clear();

? lcd.setCursor(1,0);

? lcd.print ("welcome");

? lcd.setCursor(1,1);

? lcd.print ("I love arduino");

? delay(2000);

}

void loop() {

? // put your main code here, to run repeatedly:

? int sensorVol=analogRead(analogInPin);

? int voltage=map(sensorVol,0,1023,0,500);

? showVol(voltage);

? delay(100);

}

void showVol(int vol)

{

? int vBai,vShi,vGe;

? vBai=vol/100%10;

? vShi=vol/100%10;

? vGe=vol%10;

? lcd.clear();

? lcd.setCursor(3,0);

? lcd.print ("Voltage is");

? lcd.setCursor(6,1);

? lcd.print (vBai);

? lcd.print (".");

? lcd.print (vShi);

? lcd.print (vGe);

? delay(2000);

}