#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
int POT=26;

void setup() {
 lcd.init();
 lcd.backlight();
 lcd.setCursor(0,0);
 lcd.print("tension:");
 pinMode(POT,INPUT);
}

void loop() {
  float valeur=analogRead(POT);
    float tension=valeur*5.0/4095.0;
     lcd.setCursor(1,1);
     lcd.print(tension,2);
     lcd.setCursor(6,1);
     lcd.print("V");
   delay(1000); 
}