działający chart

#include <ESPAsyncWebServer.h>
#include <SPIFFS.h>

float LUMIX_float;
int LUMIX_int;

//***dla wyświetlacza U8G2_SH1106_128X64***
  //Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
  //jak zainstalować bibliotekę U8g2 https://github.com/olikraus/u8g2/wiki/u8g2install

  #include <Wire.h>

//*****************************************

//***APDS9301 sensor światła****
  #include <Sparkfun_APDS9301_Library.h>
  APDS9301 apds;
  #define INT_PIN 15              // przerwanie z wyjścia INT sensora APDS9301 podłaczone do GPIO 15
//******************************
#include <WiFi.h>
#include "time.h"
const char* ssid       = "luzycka9_plus";
const char* password   = "aabbaacc44";
//const char* ntpServer = "pool.ntp.org";
IPAddress ip;
String IP_string;   //zmienna do wyświetlenia IP na U8g2

AsyncWebServer server(80);
String readAPDSTemperature()
{
  float t=apds.readLuxLevel();
  if(isnan(t))
  {
    Serial.println("Failed to read from APDS sensor!");
    return "";
    }
    else
    {
      Serial.println(t);
      Serial.println("ok");
  return String(t);

  }
 }

void setup()
{
  Serial.begin(115200);
 //***sensor światła***
    delay(5);    // The CCS811 wants a brief delay after startup.
    Wire.begin();
    // APDS9301 sensor setup.
    apds.begin(0x39);                                     //I2C address default
    if(!SPIFFS.begin()){
    Serial.println("An Error has occurred while mounting SPIFFS");
    return;
  }

   WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi..");
  }
  Serial.println(WiFi.localIP());

    server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(SPIFFS, "/index.html");
  });
  //String temp=readAPDSTemperature;
  server.on("/intensity", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send(200, "text/plain", readAPDSTemperature().c_str());
  });
  server.begin();
}
    // Interrupt setup

 //***connect to WiFi***




void loop(void)
 {

}