SOLVED! scroll down for the code
ORIGINAL TITLE :
[ESP8266 - OLED 0.96 NTP Clock DHT22 - SSD1306 - no matching function for call]
Hello guys,
I'm beginning in the arduino topic, i'm trying to display with an OLED screen :
- Date & Time (from a NTP server) ;
- temperature ;
- humidity ;
I've got an error with code compilation :
LINE : display.drawString(64, 50, temp);
ERROR MESSAGE : no matching function for call to 'SSD1306Wire::drawString(int, int, float&)'
I'm requesting some help from experts ... 
I do not know how to print on the Oled Screen the temperature and humidity.
I drop my code here :
// SKETCH DESCRIPTION : WEATHER STATION CLOCK - DHT22 - OLED 0,96
//
// Libraries needed:
// Time.h & TimeLib.h: https://github.com/PaulStoffregen/Time
// Timezone.h: https://github.com/JChristensen/Timezone
// SSD1306.h & SSD1306Wire.h: https://github.com/squix78/esp8266-oled-ssd1306
// NTPClient.h: https://github.com/arduino-libraries/NTPClient
// ESP8266WiFi.h & WifiUDP.h: https://github.com/ekstrand/ESP8266wifi
//
// 128x64 OLED pinout:
// GND goes to ground
// Vin goes to 3.3V
// Data to I2C SDA >>> Pour NodeMcuV2 ou V3 : PIN D1 sur SCL | PIN D2 sur SDA
// Clk to I2C SCL >>>
#include <ESP8266WiFi.h>
#include <WifiUDP.h>
#include <String.h>
#include <Wire.h>
#include <SSD1306.h>
#include <SSD1306Wire.h>
#include <NTPClient.h>
#include <Time.h>
#include <TimeLib.h>
#include <Timezone.h>
#include <DHT.h>
#include <Adafruit_Sensor.h>
// Define NTP properties
#define NTP_OFFSET 60 * 60 // In seconds
#define NTP_INTERVAL 60 * 1000 // In miliseconds
#define NTP_ADDRESS "ntp.unice.fr" // change this to whatever pool is closest (see ntp.org)
#define DHTPIN D6 // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22 // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE);
// Set up the NTP UDP client
WiFiUDP ntpUDP;
NTPClient timeClient(ntpUDP, NTP_ADDRESS, NTP_OFFSET, NTP_INTERVAL);
// Create a display object
SSD1306 display(0x3c, D2, D1); //0x3d for the Adafruit 1.3" OLED, 0x3C being the usual address of the OLED
const char* ssid = "WiFi"; // insert your own ssid
const char* password = "PWD"; // and password
String date;
String t;
const char * days[] = {"DIM", "LUN", "MAR", "MER", "JEU", "VEN", "SAM"} ;
const char * months[] = {"Janv", "Fevr", "Mars", "Avril", "Mai", "Juin", "Juil", "Aout", "Sept", "Oct", "Nov", "Dec"} ;
const char * ampm[] = {"AM", "PM"} ;
void setup ()
{
Serial.begin(115200); // most ESP-01's use 115200 but this could vary
dht.begin();
timeClient.begin(); // Start the NTP UDP client
// Wire.pins(0, 2); // Start the OLED avec SCL sur D1 et SDA sur D2
// Wire.begin(0, 2); // 0=sda, 2=scl
display.init();
display.flipScreenVertically();
// Connect to wifi
Serial.println("");
Serial.print("Connexion ...");
Serial.print(ssid);
display.drawString(20, 0, "|||||| -STARTED- ||||||");
display.drawString(0, 12, "NTP_CLO_24H_FR.ino");
display.drawString(0, 24, "Connexion au WiFi...");
// display(0, 30, NTPadress);
display.display();
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED)
{
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.print("Connexion au WiFi... ");
Serial.print(WiFi.localIP());
Serial.println("");
display.drawString(0, 35, "Connecté !");
display.display();
delay(1000);
}
void loop()
{
//read temperature and humidity
float temp = dht.readTemperature();
float humi = dht.readHumidity();
if (isnan(humi) || isnan(temp)) {
Serial.println("Failed to read from DHT sensor!");
}
if (WiFi.status() == WL_CONNECTED) //Check WiFi connection status
{
date = ""; // clear the variables
t = "";
// update the NTP client and get the UNIX UTC timestamp
timeClient.update();
unsigned long epochTime = timeClient.getEpochTime();
// convert received time stamp to time_t object
time_t local, utc;
utc = epochTime;
// Then convert the UTC UNIX timestamp to local time
TimeChangeRule usEDT = {"EDT", Second, Sun, Mar, 2, 60}; //UTC -+ change this as needed
TimeChangeRule usEST = {"EST", First, Sun, Nov, 2, 0}; //UTC -+ change this as needed
Timezone usEastern(usEDT, usEST);
local = usEastern.toLocal(utc);
// now format the Time variables into strings with proper names for month, day etc
date += days[weekday(local)-1];
date += ", ";
date += day(local);
date += " ";
date += months[month(local)-1];
date += " ";
date += year(local);
// format the time to 24-hour format
t += hour(local);
t += ":";
if(minute(local) < 10) // add a zero if minute is under 10
t += "0";
t += minute(local);
t += ":";
if(second(local) < 10) // add a zero if minute is under 10
t += "0";
t += second(local);
// Display the date and time
Serial.println("");
Serial.print(" ");
Serial.print("Local date: ");
Serial.print(date);
// Serial.println("");
Serial.print(" - ");
Serial.print("Local time: ");
Serial.print(t);
Serial.print(" - ");
// Serial.println("");
Serial.print("temp: ");
Serial.print(temp);
Serial.print("°C");
Serial.print(" - ");
Serial.print("humi: ");
Serial.print(humi);
Serial.print("%");
// print the date and time on the OLED
display.clear();
display.setTextAlignment(TEXT_ALIGN_CENTER);
display.setFont(ArialMT_Plain_24);
display.drawStringMaxWidth(64, 10, 128, t);
display.setFont(ArialMT_Plain_10);
display.drawStringMaxWidth(64, 38, 128, date);
display.drawString(64, 50, temp); !!!! ERROR !!!!
display.display();
}
else // attempt to connect to wifi again if disconnected
{
display.clear();
display.drawString(0, 10, "Reconnexion au WiFi");
display.display();
WiFi.begin(ssid, password);
display.drawString(0, 24, "Connecté !");
display.display();
delay(1000);
}
delay(1000); //Send a request to update every 10 sec (= 10,000 ms)
}