#include <Servo.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

Servo servo1;
Servo servo2;
Servo servo3;

int val1 = 0;
int val2 = 0;
int val3 = 0;

int prevVal1 = -1;
int prevVal2 = -1;
int prevVal3 = -1;

LiquidCrystal_I2C lcd(0x27, 20, 4);

void setup() {
  Serial.begin(115200);
  Serial.println("เริ่ม");

  servo1.attach(11);
  servo2.attach(10);
  servo3.attach(9);

  lcd.begin(20, 4);
  lcd.backlight();
}

void loop() {
  val1 = analogRead(A0);
  val2 = analogRead(A1);
  val3 = analogRead(A2);

  val1 = map(val1, 0, 1023, 0, 100);
  val2 = map(val2, 0, 1023, 0, 100);
  val3 = map(val3, 0, 1023, 0, 100);

  servo1.write(map(val1, 0, 100, 0, 180));
  servo2.write(map(val2, 0, 100, 0, 180));
  servo3.write(map(val3, 0, 100, 0, 180));

  Serial.print("val1: ");
  Serial.print(val1);
  Serial.print("%\tval2: ");
  Serial.print(val2);
  Serial.print("%\tval3: ");
  Serial.println(val3 + "%");

  if (val1 != prevVal1) {
    lcd.setCursor(0, 0);
    lcd.print("Val 1 :  ");
    lcd.print(val1);
    lcd.print("%   ");
    prevVal1 = val1;
  }
  if (val2 != prevVal2) {
    lcd.setCursor(0, 1);
    lcd.print("Val 2 : ");
    lcd.print(val2);
    lcd.print("%   "); 
    prevVal2 = val2;
  }
  if (val3 != prevVal3) {
    lcd.setCursor(0, 2);
    lcd.print("Val 3 : ");
    lcd.print(val3);
    lcd.print("%   "); 
    prevVal3 = val3;
  }

  delay(500);
}