Modifications

== Premier test RTC ==

== Premier test RTC ==

The first thing we'll demonstrate is a test sketch that will read the time from the RTC once a second. We'll also show what happens if you remove the battery and replace it since that causes the RTC to halt. So to start, remove the battery from the holder while the Arduino is not powered or plugged into USB. Wait 3 seconds and then replace the battery. This resets the RTC chip. Now load up the following sketch (which is also found in Examples->RTClib->ds1307) and upload it to your Arduino with the datalogger shield on!

La première chose que nous allons réaliser avec ce sketch de démonstration, c'est de lire l'heure depuis le module RTC une fois toutes les secondes.  

  <nowiki>// Date and time functions using a DS1307 RTC connected via I2C and Wire lib

 

 

 

  <nowiki>// fonctions Date et heure en utilisant

// le RTC DS1307 RTC via bus I2C et librairie Wire

#include <Wire.h>

#include <Wire.h>

   if (! RTC.isrunning()) {

   if (! RTC.isrunning()) {

     Serial.println("RTC is NOT running!");

     Serial.println("RTC n est pas en cours de fonctionnement!");

     // following line sets the RTC to the date & time this sketch was compiled

     // La ligne suivante fixe la date et l'heure du RTC avec les date et heur de compilation du sketch

     //RTC.adjust(DateTime(__DATE__, __TIME__));

     //RTC.adjust(DateTime(__DATE__, __TIME__));

   }

   }

     Serial.println("d");

     Serial.println("d");

      

      

     // calculate a date which is 7 days and 30 seconds into the future

     // Calcule une date dans le future, date ayant

    // 7 jours et 30 secondes de plus

     DateTime future (now.get() + 7 * 86400L + 30);

     DateTime future (now.get() + 7 * 86400L + 30);

      

      

     Serial.print(" now + 7d + 30s: ");

     Serial.print(" maintenant + 7d + 30s: ");

     Serial.print(future.year(), DEC);

     Serial.print(future.year(), DEC);

     Serial.print('/');

     Serial.print('/');

</nowiki>

</nowiki>

Now run the Serial terminal and make sure the baud rate is set correctly at 57600

Démarrer le moniteur série et assurez vous qu'il soit bien configuré sur un débit de 57600 bauds.

bps you should see the following:  

Vous devriez voir les messages suivants:  

[[Fichier:ADF-RTC-DS1307-USE-03.jpg]]

[[Fichier:ADF-RTC-DS1307-USE-03.jpg]]

Whenever the RTC chip loses all power (including the backup battery) it will report the time as 0:0:0 and it won't count seconds (its stopped). Whenever you set the time, this will kickstart the clock ticking. So basically the upshot here is that you should never ever remove the battery once you've set the time. You shouldn't have to and the battery holder is very snug so unless the board is crushed, the battery wont 'fall out'

A chaque fois que le composant RTC perd toutes ses sources d'alimentation (incluant donc la pile de secours) l'heure retournée it will report the time as 0:0:0 and it won't count seconds (its stopped). Whenever you set the time, this will kickstart the clock ticking. So basically the upshot here is that you should never ever remove the battery once you've set the time. You shouldn't have to and the battery holder is very snug so unless the board is crushed, the battery wont 'fall out'

== Fixer l'heure ==

== Fixer l'heure ==