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

LiquidCrystal_I2C lcd(0x27, 16, 2);

int ledR = 13;
int btnR = 2;
int valR;

int ledG = 12;
int btnG = 3;
int valG;

int ledB = 11;
int btnB = 4;
int valB;

Servo myServo;
int pos = 0;
int step = 10;
bool display = false; 

void setup() {
  pinMode(btnR, INPUT_PULLUP);
  pinMode(ledR, OUTPUT);

  pinMode(btnG, INPUT_PULLUP);
  pinMode(ledG, OUTPUT);

  pinMode(btnB, INPUT_PULLUP);
  pinMode(ledB, OUTPUT);

  lcd.init();
  lcd.backlight();

  myServo.attach(10);
  myServo.write(pos); 
}

void loop() {
  if (!display) {
    lcd.setCursor(4, 0);
    lcd.print("Press to");
    lcd.setCursor(3, 1);
    lcd.print("move servo");
    delay(2000);
    lcd.clear();
    display = true;
  }

  valR = digitalRead(btnR);
  if (valR == LOW) { 
    digitalWrite(ledR, HIGH);
    if (pos + step <= 180) { 
      pos += step;
      myServo.write(pos);
      serpos(pos);
      delay(200);
    }
  } else {
    digitalWrite(ledR, LOW);
  }

  valG = digitalRead(btnG);
  if (valG == LOW) { 
    digitalWrite(ledG, HIGH);
    if (pos - step >= 0) {  
      pos -= step;
      myServo.write(pos);
      serpos(pos);
      delay(200);
    }
  } else {
    digitalWrite(ledG, LOW);
  }

  
  valB = digitalRead(btnB);
  if (valB == LOW) {
    digitalWrite(ledB, HIGH);
    pos = 0;  
    myServo.write(pos);
    serpos(pos);  
    delay(200);
  } else {
    digitalWrite(ledB, LOW);
  }
}


void serpos(int position) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Servo Position:");
  lcd.setCursor(0, 1);
  lcd.print(position);
}