#include "LiquidCrystal_I2C.h"

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, STM32!");

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

  lcd.setCursor(0, 0);
  lcd.print("Hello, STM32");

  pinMode(A3, OUTPUT);
  pinMode(A2, OUTPUT);
  pinMode(A1, OUTPUT);
  
}

void loop() {

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("red");
  digitalWrite(A3, HIGH);
  delay(1000); 
  digitalWrite(A3, LOW);
  delay(1000); 
  
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("green");
  digitalWrite(A2, HIGH);
  delay(1000); 
  digitalWrite(A2, LOW);
  delay(1000); 

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("blue");
  digitalWrite(A1, HIGH);
  delay(1000); 
  digitalWrite(A1, LOW);
  delay(1000); 
}