#include <LiquidCrystal.h>

LiquidCrystal lcd(12,11,5,4,3,2);
int I_vo_re = A0;
int I_vo_li = A1;
int I_hi_re = A2;
int I_hi_li = A3;

float x1r = 0;
float x2r = 0;
float x3r = 0;
float x4r = 0;

void setup() {

lcd.begin(16,2);
Serial.begin(9600);

pinMode(I_vo_re, INPUT);
pinMode(I_vo_li, INPUT);
pinMode(I_hi_re, INPUT);
pinMode(I_hi_li, INPUT);
}

void loop() {

float x1 = analogRead(I_vo_li);
float x2 = analogRead(I_vo_re);
float x3 = analogRead(I_hi_re);
float x4 = analogRead(I_hi_li);
x1r = 0.8 * x1r + 0.2 * analogRead(I_vo_li);
x2r = 0.8 * x2r + 0.2 * analogRead(I_vo_re);
x3r = 0.8 * x3r + 0.2 * analogRead(I_hi_li);
x4r = 0.8 * x4r + 0.2 * analogRead(I_hi_re);

lcd.setCursor(0,0);
lcd.print(x1r/100);
lcd.setCursor(8,0);
lcd.print(x2/100);
lcd.setCursor(8,2);
lcd.print(x3/100);
lcd.setCursor(0,2);
lcd.print(x4/100);
lcd.setCursor(4,0);
lcd.print("bar");
lcd.setCursor(12,0);
lcd.print("bar");
lcd.setCursor(4,2);
lcd.print("bar");
lcd.setCursor(12,2);
lcd.print("bar");
}