#include <LiquidCrystal_I2C.h>

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
#define SENSOR_PIN  A0

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() {
  Serial.begin(115200);
  lcd.init();
  lcd.backlight();
}

void loop() {

  int adc = analogRead(SENSOR_PIN);

  // Use 3.3V reference for STM32
  int millivolts = (adc * 3300) / 1023;   // Voltage in mV
  int temperature = millivolts / 10;      // LM35 → 10mV per °C

  // Serial (no floats)
  Serial.print("ADC: ");
  Serial.print(adc);
  Serial.print("  Temp: ");
  Serial.print(temperature);
  Serial.println(" C");

  // LCD
  lcd.setCursor(0, 0);
  lcd.print("ADC: ");
  lcd.print(adc);
  lcd.print("    ");

  lcd.setCursor(0, 1);
  lcd.print("Temp: ");
  lcd.print(temperature);
  lcd.print(" C   ");

  delay(500);
}