#define BLYNK_PRINT Serial
#define BLYNK_TEMPLATE_ID "TMPL5gudIlu_d"
#define BLYNK_TEMPLATE_NAME "esp32 LM35 oled version 2"
#define BLYNK_AUTH_TOKEN "YQ_FFMlV3-4eEdzrXQAoLjXvUHI9Gh5p"

//#include <Wire.h>

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

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

#define PIN_LM35       34
#define ADC_VREF_mV    5000.0 // in millivolt, el sensor era para Arduino
#define ADC_RESOLUTION 4096.0
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
#define SCREEN_ADDRESS 0x3C ///(0x3D) See datasheet for Address;




char ssid[] = "Wokwi-GUEST";
char pass[] = "";

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
BlynkTimer tiempo;

 void Lectura() 
{  // This function describes what will happen with each timer tick  
  int adcVal = analogRead(PIN_LM35);
  float milliVolt = adcVal * (ADC_VREF_mV / ADC_RESOLUTION);
  float temperatura=milliVolt/10;
  
  Blynk.virtualWrite(V2, temperatura); 

  display.clearDisplay();
  display.setCursor(15, 0);   
  display.print("  -- HOLA ANA--   ");
  display.print("El valor de la temperatura es:");
  display.print(temperatura);
  display.display(); 

}

void setup() {
  Serial.begin(9600);
  Serial.println("Programa de control de temperatura");
  // en Wokwi
  Serial.println("Pulsa sobre el sensor LM35 para cambiar el valor de Tª");
  display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS); // initialize the OLED     
  display.setTextColor(SSD1306_WHITE);  // set text color to white
  display.setTextSize(1);

  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  tiempo.setInterval(1000L, Lectura); // Setting interval to send data to Blynk Cloud
  
 }

void loop() {
  
  Blynk.run(); // Runs all Blynk stuff  
  tiempo.run(); // runs BlynkTimer

}