#include <Adafruit_SSD1306.h> 
#include <Adafruit_GFX.h>
#include <Wire.h>

//gpio SDA 21
//gpio SCL 22

#define LarguraTela 128
#define AlturaTela 64
#define lm35 34
#define VrefadcEsp32 3300.0 //tensão de referencia do adc em mV
#define AdcSpan 4095.0 //12 bits

#define OLED_RESET -1
#define END_OLED 0X3C
Adafruit_SSD1306 oled(LarguraTela, AlturaTela, &Wire, OLED_RESET);//instancia

int iadcLM35;
float fmV, ftempC, ftempF, fSpTemp, fHist; //ler a tensão mV

void setup() 
{
  Serial.begin(9600);
  analogReadResolution(12);
  if(!(oled.begin(SSD1306_SWITCHCAPVCC, END_OLED)))
  {
   Serial.println("Falha de inicialização");
   for(;;); //loop infinito esperando o display inicializar
  }
  pinMode(lm35, INPUT);
}

void loop() 
{
  iadcLM35=analogRead(lm35);
  fmV=iadcLM35*(VrefadcEsp32/AdcSpan);
  ftempC=fmV/10;
  Serial.println("Milivolts lido: "+String(ftempC));
  delay(1000);
}