Problème pour ajouter la date et l'heure à mes mesures sur carte SD

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11 
/*
  SD card datalogger

 
 The circuit:
 * analog sensors on analog ins 0, 1, and 2
 * SD card attached to SPI bus as follows:
 ** MOSI - pin 11
 ** MISO - pin 12
 ** CLK - pin 13
 ** CS - pin 4 (for MKRZero SD: SDCARD_SS_PIN)

 
 
 */

#include <SPI.h>
#include <SD.h>
#include <stdio.h>
#include <DS1302.h>
#include <Time.h>

const int chipSelect = 4;
const int kCePin   = 5;  // Chip Enable
const int kIoPin   = 6;  // Input/Output
const int kSclkPin = 7;  // Serial Clock

// Create a DS1302 object.
DS1302 rtc(kCePin, kIoPin, kSclkPin);

String dayAsString(const Time::Day day) {
  switch (day) {
    case Time::kSunday: return "Sunday";
    case Time::kMonday: return "Monday";
    case Time::kTuesday: return "Tuesday";
    case Time::kWednesday: return "Wednesday";
    case Time::kThursday: return "Thursday";
    case Time::kFriday: return "Friday";
    case Time::kSaturday: return "Saturday";
  }
  return "(unknown day)";
}
  void printTime() {
  // Get the current time and date from the chip.
  Time t = rtc.time();

  // Name the day of the week.
  const String day = dayAsString(t.day);

  // Format the time and date and insert into the temporary buffer.
  char buf[50];
  snprintf(buf, sizeof(buf), "%s %04d-%02d-%02d %02d:%02d:%02d",
           day.c_str(),
           t.yr, t.mon, t.date,
           t.hr, t.min, t.sec);
  }

void setup() {
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
 
  // Initialize a new chip by turning off write protection and clearing the
  // clock halt flag. These methods needn't always be called. See the DS1302
  // datasheet for details.
  rtc.writeProtect(false);
  rtc.halt(false);

   // Make a new time object to set the date and time.
  // Sunday, September 22, 2013 at 01:38:50.
  Time t(2017, 10, 20,19, 38, 50, Time::kThursday);

  // Set the time and date on the chip.
  rtc.time(t);
 
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }


  Serial.print("Initializing SD card...");

  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    // don't do anything more:
    return;
  }
  Serial.println("card initialized.");
}

void loop() {
  // make a string for assembling the data to log:
  String dataString = "";

  // read three sensors and append to the string:
 
C'est à ce niveau que je souhaite inscrire la date et l'heure mais je ne vois pas quelle syntaxe utiliser   
 
    float sensor1=analogRead(A0);
    float temperatureV = ((sensor1*5)/1023);
    float temp=((temperatureV-0.5)*100);
    dataString += String(temp);
    dataString += ",";
   
    float sensor2=analogRead(A1);
    float pressionV = ((sensor2*5)/1023);
    float pression = pressionV*1000;
    dataString += String(pression);
    dataString += ",";
   
    float sensor3=analogRead(A2);
    float hygroV = ((sensor3*5)/1023);
    float hygro = ((hygroV-0.826)/0.0315);
    dataString += String(hygro);
   


  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  File dataFile = SD.open("datalog.txt", FILE_WRITE);

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the serial port too:
    Serial.println(dataString);
    delay(10000);
  }
  // if the file isn't open, pop up an error:
  else {
    Serial.println("error opening datalog.txt");
  }
}

Merci pour les indications :slight_smile: