Wokwi - Online ESP32, STM32, Arduino Simulator

#include <Arduino.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <WiFi.h>
#include <ESPAsyncWebServer.h>

const char* ssid="Wokwi-GUEST";
const char* password="";

const double VCC = 3.3;             // ESP32-DevKitV1 DoIt on board 3.3v vcc
const double R2 = 10000;            // 10k ohm series resistor
const double adc_resolution = 4095; // 12-bit adc

const double A = 0.001129148;   // thermistor equation parameters
const double B = 0.000234125;
const double C = 0.0000000876741; 

AsyncWebServer server(80); //Server Port

#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(115200);  /* Define baud rate for serial communication */
  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }
  delay(2000);
  display.clearDisplay();
  display.setTextColor(WHITE);
  //Connect to WiFi
  WiFi.begin(ssid,password);
  while (WiFi.status() !=WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to Wifi...");
    Serial.println(ssid);
    }
    Serial.print ("connected to WiFi");
    //Print IP Address
    Serial.print("ESP32 Web Server's IP:");
    Serial.println(WiFi.localIP());

    //Define route to serve HTML page
    server.on("/", HTTP_GET, [](AsyncWebServerRequest* request) {
      Serial.println("ESP32 Web Server:New Request Received:");
      Serial.println("GET /");
      request->send (200, "text/html", "<html><body><h1>Hello, ESP32!</h1></body></html>");
    });

  //Start Server
  server.begin();
    }
 
  double getTemperature(){
  double Vout, Rth, temperature, temperature1, adc_value;
  adc_value = analogRead(36);
  Vout = (adc_value * VCC) / adc_resolution;
  Rth = (VCC * R2 / Vout) - R2;

/*  Steinhart-Hart Thermistor Equation:
 *  Temperature in Kelvin = 1 / (A + B[ln(R)] + C[ln(R)]^3)
 *  where A = 0.001129148, B = 0.000234125 and C = 8.76741*10^-8  */
   temperature = (1 / (A + (B * log(Rth)) + (C * pow((log(Rth)),3))));   // Temperature in kelvin
   temperature = (temperature-273.15);  // Temperature in degree celsius
    return temperature;
  }

void loop() {   
    Serial.print("Temperature = ");
  Serial.print(getTemperature());
  Serial.println(" degree celsius");

  display.clearDisplay(); // clear OLED display
  
  // display temperature
  display.setTextSize(2);
  display.setCursor(0,0);
  display.print("Temp:");
  display.setTextSize(2);
  //display.setCursor(0,10);
  display.print(getTemperature(),1);
  //display.print(" ");
  display.setTextSize(2);
  //display.cp437(true);
  //display.write(167);
  display.setTextSize(2);
  display.print("C");
  
  // display ADC Value
  display.setTextSize(2);
  display.setCursor(0, 35);
  display.print("ADC:");
  display.setTextSize(2);
  //display.setCursor(0, 45);
  //display.print(adc_value,0);
  //display.print(" bits"); 
  
  display.display(); 
  
  delay(1500);}