#include "U8glib.h"

U8GLIB_SSD1306_128X64 u8g(U8G_I2C_OPT_DEV_0 | U8G_I2C_OPT_NO_ACK | U8G_I2C_OPT_FAST); // Fast I2C / TWI

int valorTemp = 0;
const float BETA = 3950;
char buffer[20];

#define Campainha 8;

unsigned long startMillis;  //some global variables available anywhere in the program
unsigned long currentMillis;



void setup() {
  u8g.setFont(u8g_font_tpssb);
  u8g.setColorIndex(1);

   pinMode(8, OUTPUT);
  startMillis = millis();
}

void loop() {
  u8g.firstPage();

 currentMillis = millis();
  if (analogRead(A0) <= 500) {
  if (currentMillis - startMillis <= 200)  tone(8, 1000, 250);
  if (currentMillis - startMillis > 200)  noTone(8);
  if (currentMillis - startMillis > 400)  startMillis = currentMillis;   
      
  }
    else {
     noTone(8);
    }
  //Serial.begin(9600);
 // Serial.println(analogRead(A0));

 

  do {

    dtostrf(1 / (log(1 / (1023. / valorTemp - 1)) / BETA + 1.0 / 298.15) - 273.15, 1, 1, buffer);
    sprintf(buffer, "%s%s", buffer, " Celsius");
    
    u8g.drawStr(25, 50, buffer);
    

    u8g.drawFrame(0, 10, 128, 20);
    u8g.drawBox(10, 15,  map(valorTemp, 953, 115, 0, 108), 10);
  } while ( u8g.nextPage() );

  valorTemp = analogRead(A0);

  

  


  }