RTC DS1307 [SOLVED]

[Norberto Pinheiro]

hello fernando
I did upload the code to the Arduino mega and the clock does not work.

I have a DS1307 RTC

I went to this page:
viewtopic.php?f=8&t=42

I tested the code and the rtc (pins 20, 21 - SDA, SCL) and it worked.
on pins 18, 19 does not work

I changed the code to the pins ferduino 20,21 and did not work.
also tested with pins 18,19 but did not work.

with the pins 18, 19 appears:
xxxxxxxxx85 of xxxxxxx 2165

with the pins 20, 21 appears:
xxxxxx 2000 xxxxxxxxxx05

and I can not set the date

can you help me?

PS: Sorry my english

[Fernando Garcia]

Hi!

Using the code available on topic called "codes for tests" you can't use pins 18 and 19. It works only with I2C (20 and 21).

Try the example "Search for I2C devices" to see if the Arduino can find the RTC.

What's the model of your RTC?

Best regards.

[Norberto Pinheiro]

hi Fernando,
thanks for the quick response

I have a RTC DS1307

I've tried the example "Search for I2C devices" and it works, he found two:
I2C device found at address 0x50!
I2C device found at address 0x68!



in the code ferduino I replaced this:

DS1307 rtc (18, 19); // Indicates which pins are connected to the RTC. (20, 21)
Time t_temp, t;

by this:

const int I2C_address = 0x68;
DS1307 rtc (20, 21); // Indicates which pins are connected to the RTC. (20, 21)
Time t_temp, t;

can you help me?

[Fernando Garcia]

This module have an EEPROM on board.

Check this topic.

The address for DS1307 is 0x68.

[Norberto Pinheiro]

I do not understand, because RTC is equal to the 1st photo of the 3 post, should work on pins 20 and 21, right?

but it's weird because sometimes one appears:

xxxxxx85 of xxxxxxx 2165

and other displays:

xxxxxx01 xxxxxxxx 2010

what can it be?

[Fernando Garcia]

Ferduino uses Henning's library and Henning's library isn't compatible with this module.

Buy a RTC without EEPROM on board.

This is your second problem because you bought pieces without look this topic.

[Norberto Pinheiro]

Fernando Garcia » 11 minutes ago wrote:

Ferduino uses Henning's library and Henning's library isn't compatible with this module.

Buy a RTC without EEPROM on board.

OK, I did not know

I did not buy the material for this project, I am using mateiral that had

[Norberto Pinheiro]

hello Fernando,
could you tell me if this RTC is compatible with the Ferduino?

Thank you
Norberto Pinheiro

[Fernando Garcia]

Hi!

Yes, is compatible.

And this circuit too.

Best regards.

[Norberto Pinheiro]

Great Fernando

Thank you
Norberto Pinheiro

[Norberto Pinheiro]

Fernando Garcia » Sat Nov 22, 2014 3:00 pm wrote:

Hi!

Yes, is compatible.

And this circuit too.

Image: http://img339.imageshack.us/img339/2475/ds1307.jpg

Best regards.

hello fernando,
I'm trying to mount the RTC as the schema.
my connections are:

xxxxxx
pin 1 x x pin 5
pin 2 x x pin 6
pin 3 x x pin SCL
pin 4 x x pin SDA
xxxxxx


pin 4 =>GND
pin 3 => + battery
pin 2 => Cristal 32.768Khz
pin 1 => Cristal 32.768Khz
pin 5 => Diodo 1N4148 => 5V
pin 6 =>GND
pin SCL => 10K resistor => pin 21 Arduino Mega
pin SDA => 10K resistor => pin 20 Arduino Mega

but does not work, I've tested it with the code for rtc thishttp://www.ferduino.com/forum/viewtopic.php?f=8&t=42 page and not work.

I tried the same code but with another rtc I have, (with EEPROM) and gave.
You can help me?

[Fernando Garcia]

Hi!

I don't understand fine what you told but, seems wrong.

Some pictures can help.

Best regards.

[Norberto Pinheiro]

hello Fernando,
I did many tests and I just connect the watch to the Arduino , it works , but when I turn all no longer works.
the problem is only when I connect the GND of the RTC to the Arduino.

I made the connections at is this site

You made helpme to solve this problem, please ?

[Fernando Garcia]

Maybe this battery is bad.

Do test without battery.

[Norberto Pinheiro]

Fernando Garcia » 3 minutes ago wrote:

Maybe this battery is bad.

Do test without battery.

test without baterry with code RTC in this pageand works.

but with ferduino code dont work

[Fernando Garcia]

Are you using a external power supply (7-12V)?

[Norberto Pinheiro]

no, I'm powering the Arduino with usb cable

[Fernando Garcia]

Try it!

Using 12V the regulator can overheat, take care.

[Norberto Pinheiro]

Fernando,
I put the code of RTC in the ferduino code and the message in the serial print is:


I2C device found at address 0x68 !

if ferduino found RTC then it should work, right ?

[Fernando Garcia]

Yes, but the RTC doesn't work with low voltage.

Try this code:

Code: Select all


#include <DS1307henning.h>

// Init the DS1307
DS1307 rtc(20, 21);

void setup()
{
  // Set the clock to run-mode
  rtc.halt(false);
 
  // Setup Serial connection
  Serial.begin(9600);

  // The following lines can be commented out to use the values already stored in the DS1307
  rtc.setDOW(DOMINGO);        // Set Day-of-Week to SUNDAY
  rtc.setTime(12, 0, 0);     // Set the time to 12:00:00 (24hr format)
  rtc.setDate(3, 10, 2010);   // Set the date to October 3th, 2010
}

void loop()
{
  // Send Day-of-Week
  Serial.print(rtc.getDOWStr());
  Serial.print(" ");
 
  // Send date
  Serial.print(rtc.getDateStr());
  Serial.print(" -- ");

  // Send time
  Serial.println(rtc.getTimeStr());
 
  // Wait one second before repeating :)
  delay (1000);
}