Problemas con I2C...LCD+RTC1307

Gixxer · April 5, 2011, 9:39pm

hola, acudo a vosotros porque hay algo que se me escapa.
Tengo un Arduino UNO conectado a 2 pantallas LCD con dirección I2C 0x62
Le he conectado un RTC1307 con dirección 0x68

El problema es que si tengo conectado 1 o 2 pantallas LCDs la lectura de la hora devuelve esto:

23:31:19  5/4/11  Day_of_week:2
23:31:20  5/4/11  Day_of_week:2
23:31:21  5/5/165  Day_of_week:2
0:3:11  0/2/0  Day_of_week:0
23:31:23  165/165/165  Day_of_week:5
23:31:25  5/5/165  Day_of_week:2
0:0:0  0/0/0  Day_of_week:0
23:31:27  5/4/11  Day_of_week:2
0:0:3  2/0/20  Day_of_week:0
23:31:29  5/4/23  Day_of_week:2
23:31:30  5/4/11  Day_of_week:2
45:63:0  165/165/165  Day_of_week:165
23:31:32  5/4/11  Day_of_week:2
23:31:33  5/4/11  Day_of_week:2
23:31:34  5/4/11  Day_of_week:2
0:0:0  0/0/0  Day_of_week:0
23:31:36  5/9/165  Day_of_week:2
23:31:37  5/4/11  Day_of_week:2
0:0:0  0/0/0  Day_of_week:0
23:31:39  5/4/11  Day_of_week:2
0:0:3  2/0/20  Day_of_week:0
23:31:41  165/165/165  Day_of_week:165
23:32:21  0/0/0  Day_of_week:0
23:32:22  5/9/165  Day_of_week:2
0:0:0  0/0/0  Day_of_week:0
23:32:24  5/4/0  Day_of_week:2
0:0:3  2/0/20  Day_of_week:0
0:22:1  0/0/10  Day_of_week:0
23:32:27  5/4/11  Day_of_week:2
23:32:28  5/4/11  Day_of_week:2
45:65:29  165/165/165  Day_of_week:165
23:32:30  5/4/11  Day_of_week:2
0:0:0  0/0/0  Day_of_week:0
45:165:25  165/165/165  Day_of_week:165
23:32:34  165/165/165  Day_of_week:165
23:32:35  5/4/11  Day_of_week:2
23:32:36  5/0/0  Day_of_week:2
23:32:37  5/4/23  Day_of_week:2
23:32:38  5/4/11  Day_of_week:2
0:0:3  2/0/20  Day_of_week:0
0:0:0  0/0/0  Day_of_week:0
23:32:41  5/4/11  Day_of_week:2
7:32:42  165/165/165  Day_of_week:165
23:32:43  5/4/11  Day_of_week:2
23:32:44  5/4/11  Day_of_week:2
23:32:45  5/4/11  Day_of_week:2
0:0:46  0/0/0  Day_of_week:0
23:32:47  5/4/11  Day_of_week:2
0:0:0  0/0/0  Day_of_week:0
23:32:49  5/165/165  Day_of_week:2
45:165:51  165/165/165  Day_of_week:165
45:65:51  165/165/165  Day_of_week:165
23:32:52  5/4/11  Day_of_week:2
23:32:53  5/4/11  Day_of_week:2
23:32:54  5/4/11  Day_of_week:2
0:0:3  2/0/20  Day_of_week:0
45:25:1  165/165/165  Day_of_week:165
23:32:57  5/4/11  Day_of_week:2
23:32:58  5/4/11  Day_of_week:2
23:32:59  5/4/11  Day_of_week:2
23:33:0  5/4/11  Day_of_week:2
23:33:2  5/4/11  Day_of_week:2
23:33:3  5/4/11  Day_of_week:2
0:0:3  165/165/165  Day_of_week:1
0:0:0  0/0/0  Day_of_week:0
23:33:6  5/4/11  Day_of_week:2
23:33:7  5/4/11  Day_of_week:2
23:33:8  5/4/11  Day_of_week:2
45:67:9  165/165/165  Day_of_week:165
[color=red]23:33:10  5/4/11  Day_of_week:2
23:33:11  5/4/11  Day_of_week:2
23:33:12  5/4/11  Day_of_week:2
23:33:13  5/4/11  Day_of_week:2
23:33:14  5/4/11  Day_of_week:2
23:33:15  5/4/11  Day_of_week:2
23:33:16  5/4/11  Day_of_week:2
23:33:17  5/4/11  Day_of_week:2
23:33:18  5/4/11  Day_of_week:2
23:33:19  5/4/11  Day_of_week:2
23:33:20  5/4/11  Day_of_week:2[/color]

en cambio, si dejo solamente el RTC, la hora la muestra correctamente, como puede verse a partir del 23:33:11

alguna idea de porque ocurre?
estoy usando 2 resistencias de 10K que me venian con los RTC. a lo mejor hay que usar otras de otro valor? como se calcula esto?

muchas gracias por vuestra ayuda.

Gixxer · April 6, 2011, 10:50am

nadie puede ayudarme?

estoy totalmente perdido y esto me bloquea tanto el registro de la hora por RTC y la lectura de un acelerometro por I2C.

se agradece cualquier idea.

system · April 6, 2011, 11:14am

Deberías de cambiar la dirección I2C en las pantallas LCD aunque este no sea el problema, una misma direccion para dos dispositivos nunca lo habia visto antes.
Las resistencias pueden ser de 4k7 o también 10K, incluso si los cables son cortos puedes prescindir de ellas.

Pon el codigo para ver donde esta el problema, hace tiempo probé esto mismo y no tuve ningun problema, la pantalla me la fabrique con un PCF8574

Saludos

Gixxer · April 6, 2011, 6:18pm

hola flico, gracias por tu interes en ayudarme. Mira el codigo que utilizo es este, tanto para leer la hora como para establecerla:

//
// Maurice Ribble
// 4-17-2008
// http://www.glacialwanderer.com/hobbyrobotics

// This code tests the DS1307 Real Time clock on the Arduino board.
// The ds1307 works in binary coded decimal or BCD.  You can look up
// bcd in google if you aren't familior with it.  There can output
// a square wave, but I don't expose that in this code.  See the
// ds1307 for it's full capabilities.

#include "Wire.h"
#define DS1307_I2C_ADDRESS 0x68

// Convert normal decimal numbers to binary coded decimal
byte decToBcd(byte val)
{
  return ( (val/10*16) + (val%10) );
}

// Convert binary coded decimal to normal decimal numbers
byte bcdToDec(byte val)
{
  return ( (val/16*10) + (val%16) );
}

// Stops the DS1307, but it has the side effect of setting seconds to 0
// Probably only want to use this for testing
/*void stopDs1307()
{
  Wire.beginTransmission(DS1307_I2C_ADDRESS);
  Wire.send(0);
  Wire.send(0x80);
  Wire.endTransmission();
}*/

// 1) Sets the date and time on the ds1307
// 2) Starts the clock
// 3) Sets hour mode to 24 hour clock
// Assumes you're passing in valid numbers
void setDateDs1307(byte second,        // 0-59
                   byte minute,        // 0-59
                   byte hour,          // 1-23
                   byte dayOfWeek,     // 1-7
                   byte dayOfMonth,    // 1-28/29/30/31
                   byte month,         // 1-12
                   byte year)          // 0-99
{
   Wire.beginTransmission(DS1307_I2C_ADDRESS);
   Wire.send(0);
   Wire.send(decToBcd(second));    // 0 to bit 7 starts the clock
   Wire.send(decToBcd(minute));
   Wire.send(decToBcd(hour));      // If you want 12 hour am/pm you need to set
                                   // bit 6 (also need to change readDateDs1307)
   Wire.send(decToBcd(dayOfWeek));
   Wire.send(decToBcd(dayOfMonth));
   Wire.send(decToBcd(month));
   Wire.send(decToBcd(year));
   Wire.endTransmission();
}

// Gets the date and time from the ds1307
void getDateDs1307(byte *second,
          byte *minute,
          byte *hour,
          byte *dayOfWeek,
          byte *dayOfMonth,
          byte *month,
          byte *year)
{
  // Reset the register pointer
  Wire.beginTransmission(DS1307_I2C_ADDRESS);
  Wire.send(0);
  Wire.endTransmission();

  Wire.requestFrom(DS1307_I2C_ADDRESS, 7);

  // A few of these need masks because certain bits are control bits
  *second     = bcdToDec(Wire.receive() & 0x7f);
  *minute     = bcdToDec(Wire.receive());
  *hour       = bcdToDec(Wire.receive() & 0x3f);  // Need to change this if 12 hour am/pm
  *dayOfWeek  = bcdToDec(Wire.receive());
  *dayOfMonth = bcdToDec(Wire.receive());
  *month      = bcdToDec(Wire.receive());
  *year       = bcdToDec(Wire.receive());
}

void setup()
{
  byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;
  Wire.begin();
  Serial.begin(9600);

  // Change these values to what you want to set your clock to.
  // You probably only want to set your clock once and then remove
  // the setDateDs1307 call.
  second = 30;
  minute = 55;
  hour = 13;
  dayOfWeek = 6;
  dayOfMonth = 19;
  month = 3;
  year = 11;
  //DESCOMENTAR ESTA LINEA PARA PONER EN HORA....................................................................
//  setDateDs1307(second, minute, hour, dayOfWeek, dayOfMonth, month, year);
}

void loop()
{
  byte second, minute, hour, dayOfWeek, dayOfMonth, month, year;

  getDateDs1307(&second, &minute, &hour, &dayOfWeek, &dayOfMonth, &month, &year);
  Serial.print(hour, DEC);
  Serial.print(":");
  Serial.print(minute, DEC);
  Serial.print(":");
  Serial.print(second, DEC);
  Serial.print("  ");
  Serial.print(dayOfMonth, DEC);
  Serial.print("/");
  Serial.print(month, DEC);
  Serial.print("/");
  Serial.print(year, DEC);
  Serial.print("  Day_of_week:");
  Serial.println(dayOfWeek, DEC);

  delay(1000);
}

Si quito 1 de las pantallas LCD y dejo solo una conectada, obtengo el mismo problema:

20:14:35  6/4/11  Day_of_week:3
20:14:36  165/165/165  Day_of_week:7
0:0:0  0/0/0  Day_of_week:0
20:14:38  6/4/11  Day_of_week:3
20:14:39  165/165/165  Day_of_week:7
20:14:40  6/4/11  Day_of_week:3
0:0:0  0/0/0  Day_of_week:0
20:14:42  6/4/11  Day_of_week:3
20:14:43  6/4/11  Day_of_week:3
20:14:44  6/4/11  Day_of_week:3
20:14:45  6/4/11  Day_of_week:3
0:0:3  2/0/20  Day_of_week:0
20:14:47  6/4/11  Day_of_week:3
20:14:48  6/4/11  Day_of_week:3
20:14:49  6/4/11  Day_of_week:3
20:14:50  6/4/11  Day_of_week:3
20:14:51  6/4/11  Day_of_week:3
20:14:52  6/4/11  Day_of_week:3
0:0:53  0/0/0  Day_of_week:0
20:14:54  6/4/11  Day_of_week:3
20:14:55  6/4/11  Day_of_week:3
20:14:56  6/4/11  Day_of_week:3
20:14:57  6/4/11  Day_of_week:3
0:0:59  0/0/0  Day_of_week:0
20:15:0  6/4/11  Day_of_week:3
20:15:1  6/4/11  Day_of_week:3
20:15:2  6/4/11  Day_of_week:3
20:15:3  6/4/11  Day_of_week:3
20:15:4  6/4/11  Day_of_week:3
20:15:5  6/4/11  Day_of_week:3
20:15:6  6/4/11  Day_of_week:3
20:15:7  6/4/11  Day_of_week:3
20:15:8  6/4/11  Day_of_week:3
20:15:9  6/4/11  Day_of_week:3
20:15:10  6/4/11  Day_of_week:3
20:15:11  6/9/165  Day_of_week:3
20:15:12  6/4/11  Day_of_week:3
1:15:13  165/165/165  Day_of_week:165
20:15:14  6/4/11  Day_of_week:3
20:15:15  6/4/11  Day_of_week:3
20:15:16  6/4/11  Day_of_week:3
20:15:17  6/4/11  Day_of_week:3
20:15:18  6/4/11  Day_of_week:3
20:15:19  6/4/11  Day_of_week:3
20:15:20  6/9/165  Day_of_week:3
20:15:21  6/4/11  Day_of_week:3
20:15:22  6/4/11  Day_of_week:3
20:15:23  6/4/11  Day_of_week:3
20:15:24  6/4/11  Day_of_week:3
0:0:3  2/0/20  Day_of_week:0
20:15:26  6/4/11  Day_of_week:3

por lo que no creo que sea problema de la doble dirección lcd ya que ahora no estan conectadas las 2, solo 1.

si dejo solo conectado el RTC...

20:16:28  6/4/11  Day_of_week:3
20:16:29  6/4/11  Day_of_week:3
20:16:30  6/4/11  Day_of_week:3
20:16:31  6/4/11  Day_of_week:3
20:16:32  6/4/11  Day_of_week:3
20:16:33  6/4/11  Day_of_week:3
0:0:3  2/0/20  Day_of_week:0
20:16:35  6/4/11  Day_of_week:3
20:16:36  6/4/11  Day_of_week:3
20:16:37  6/4/11  Day_of_week:3
20:16:38  6/4/11  Day_of_week:3
20:16:39  6/4/11  Day_of_week:3
20:16:41  6/4/11  Day_of_week:3
20:16:42  6/4/11  Day_of_week:3
20:16:43  6/4/11  Day_of_week:3
20:16:44  6/4/11  Day_of_week:3
20:16:45  6/4/11  Day_of_week:3
20:16:46  6/4/11  Day_of_week:3
20:16:47  6/4/11  Day_of_week:3
20:16:48  6/4/11  Day_of_week:3
20:16:49  6/4/11  Day_of_week:3
20:16:50  6/4/11  Day_of_week:3
20:16:51  6/4/11  Day_of_week:3
20:16:52  6/4/11  Day_of_week:3
20:16:53  6/4/11  Day_of_week:3
20:16:54  6/4/11  Day_of_week:3
20:16:55  6/4/11  Day_of_week:3
20:16:56  6/4/11  Day_of_week:3
20:16:57  6/4/11  Day_of_week:3
20:16:58  6/4/11  Day_of_week:3
20:16:59  6/4/11  Day_of_week:3
20:17:0  6/4/11  Day_of_week:3
20:17:1  6/4/11  Day_of_week:3
20:17:2  6/4/11  Day_of_week:3
20:17:3  6/4/11  Day_of_week:3
20:17:4  6/4/11  Day_of_week:3
20:17:5  6/4/11  Day_of_week:3
20:17:6  6/4/11  Day_of_week:3
20:17:7  6/4/11  Day_of_week:3
20:17:8  6/4/11  Day_of_week:3
20:17:9  6/4/11  Day_of_week:3
20:17:11  6/4/11  Day_of_week:3

si conecto las 2 LCDs se puede ver como la situación es mucho peor, pero que los datos si que estan correctos en el modulo RTC, solo que no los coge bien

21:30:25  165/165/165  Day_of_week:165
0:0:0  0/0/0  Day_of_week:0
20:30:27  0/0/0  Day_of_week:3
20:30:28  6/4/0  Day_of_week:3
3:0:3  165/165/165  Day_of_week:165
45:61:30  165/165/165  Day_of_week:165
45:165:31  165/165/165  Day_of_week:165
20:30:32  165/165/165  Day_of_week:7
0:0:0  0/0/0  Day_of_week:0
3:30:34  165/165/165  Day_of_week:165
20:30:35  6/4/11  Day_of_week:3
20:30:36  21/165/165  Day_of_week:3
20:30:37  6/4/11  Day_of_week:3
45:165:7  165/165/165  Day_of_week:165
20:30:39  165/165/165  Day_of_week:7
20:30:40  6/0/0  Day_of_week:3
0:0:0  0/0/0  Day_of_week:0
20:30:42  0/0/0  Day_of_week:3
3:11:4  1/165/165  Day_of_week:0
20:30:44  6/4/11  Day_of_week:3
20:30:45  6/4/11  Day_of_week:3
0:0:0  0/0/0  Day_of_week:0
20:30:48  6/9/165  Day_of_week:3
0:0:0  0/0/0  Day_of_week:0
20:30:50  165/165/165  Day_of_week:25
20:30:51  6/4/11  Day_of_week:3
0:0:3  2/0/20  Day_of_week:0
20:30:53  6/4/11  Day_of_week:3
20:30:54  0/0/0  Day_of_week:3
20:30:55  6/0/0  Day_of_week:3
0:0:0  0/0/0  Day_of_week:0
20:30:57  6/4/11  Day_of_week:3
21:30:58  165/165/165  Day_of_week:165
20:30:59  6/4/11  Day_of_week:3
0:0:0  0/0/0  Day_of_week:0
20:31:1  0/0/0  Day_of_week:0

Gixxer · April 7, 2011, 1:42pm

nadie?

no quiero ser pesado pero es que estoy totalmente bloqueado hasta solucionar esto.
muchas gracias

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Problemas con I2C...LCD+RTC1307

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