RTC don't work

[zio Tonino]

good morning,
I have a problem with the module rtc, I'm trying to connect it directly via pins to Arduino! I tried to set the following parameters in the setup:

Code: Select all




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

#include <Wire.h>
#include <RTClib.h>
RTC_DS1307 RTC;

 
void setup () {

 
  Serial.begin(9600);
    Wire.begin();
    RTC.begin();
   
  pinMode(A3,OUTPUT);
  pinMode(A2,OUTPUT);
  digitalWrite(A3,HIGH);
  digitalWrite(A2,LOW);
   

  if (! RTC.isrunning()) {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    RTC.adjust(DateTime(12/06/2012, 10:30:00));
  }

  pinMode(13,OUTPUT);
}

void loop () {
    DateTime now = RTC.now();
   
Serial.println(now.minute(),DEC);


if(now.hour()==10 && now.minute()==26){
   Serial.println("sono le ore: 10:26");
   }
   
    Serial.print(now.year(), DEC);
    Serial.print('/');
   
        if(now.month()<10){
      Serial.print("0");
    }
   
    Serial.print(now.month(), DEC);
    Serial.print('/');
   
        if(now.day()<10){
      Serial.print("0");
    }
   
    Serial.print(now.day(), DEC);
    Serial.print(' ');
   
        if(now.hour()<10){
      Serial.print("0");
    }
    Serial.print(now.hour(), DEC);
    Serial.print(':');
   
        if(now.minute()<10){
      Serial.print("0");
    }
    Serial.print(now.minute(), DEC);
    Serial.print(':');
   
    if(now.second()<10){
      Serial.print("0");
    }
   
    Serial.print(now.second(), DEC);
    Serial.println();

    delay(1000);
}

but Arduino seems not work! it seems as if the serial port does not work.
The LED blinks only when I deadlift rtc module, otherwise it is turned on and fixed.
In any case, both with and without the rtc module, the monitor serial does not show anything! What is wrong?

Thanks

[zio Tonino]

Ok, now It works!
I changed serial.begin from 56700 to 9600! all charactes were garbled!


Now I have a problem with setting time:
RTC.adjust(DateTime(__DATE__, __TIME__));
My pc says 10.40 ... arduino 10.38!
O_ò

[adafruit_support_bill]

Code: Select all

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

That will set the RTC to the time the sketch was compiled. The Arduino will always be a little behind because of the time it takes to upload the sketch to the Arduino.

[zio Tonino]

Thanks for the answer!
Arduino takes about 30 second to upload sketch! Not 4 minutes!

[adafruit_support_bill]

You also have to factor in the time it takes to compile on your system. Since the time is only being reported with one minute resolution, the actual time difference between 10:38 and 10:40 could be as little as 61 seconds.