#include <LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

void setup() {
  lcd.begin(16, 2);
}

void loop() {
  int sensor = analogRead(A0);

  /* Cam bien LM35
 
  float voltage = sensor / 1023.0 * 5.0;
  float temperature = voltage * 100.0;
 
  Ket thuc cam bien LM35 */ 

  // Cam bien gia lap

  const float BETA = 3950;
  float temperature = 1 / (log(1 / (1023. / sensor - 1)) / BETA + 1.0 / 298.15) - 273.15;

  // Ket thuc cam bien gia lap */


  lcd.setCursor(0,0);
  lcd.print("Nhiet do:");
  lcd.setCursor(0,1);
  lcd.print(temperature);
  lcd.print(" ");
  lcd.print((char)223);
  lcd.print("C");
  delay(200);
}