Anyone could do the same project with any screen as long as the library that is driving the screen is based off the print class. All you have to do is modify the code for reading the buttons and the code to print to the screen as the logic should work with all libraries based off the print class. Like lcd.write --> tft.write

It's a great project!

Some advice: Using the keyword const in front of a variable saves SRAM!

Use this code:

#include<LiquidCrystal.h>
LiquidCrystal lcd(12,11,5,4,3,2);
int analogPin=1;
void setup()
{
lcd.begin(16,2);
}
void loop()
{
int v=analogRead(analogPin);
int voltage=v/1023*5.0;
lcd.print("voltage=");
lcd.print(voltage);
}