RTC SD2405 I2C and LCD1602 RGB :The RTC library interferes with the operation of the LCD module.

Hello.

I have a strange phenomenon concerning I2C bus modules.

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Modules: RTC SD2405 I2C and LCD1602 RGB

I'm trying to display text on an LCD. It works fine until I use the RTC module. Then it starts endlessly displaying the last letter of the text.

(Everything from one company DFRobot , i belive it should work together)

The simplified code looks like this:

#include "GravityRtc.h"

#include "Wire.h"

#include "DFRobot_RGBLCD1602.h"

GravityRtc rtc; // Init RTC

DFRobot_RGBLCD1602 lcd(/*RGBAddr*/0x2D ,/*lcdCols*/16,/*lcdRows*/2);  //16 characters and 2 lines of show
 

void setup() {

  Serial.begin(9600);

  rtc.setup();

  lcd.init();

  lcd.setRGB(111,254,244);

lcd.print("Texting");

}
 

void loop() {

rtc.read();

  Serial.print("   Hour = ");   // godzina

  Serial.print(rtc.hour);

  Serial.print("   Minute = "); // minuta

  Serial.print(rtc.minute);

  Serial.print("   Second = "); // sekunda

  Serial.println(rtc.second);

}

But if I disconect modul of RTC , its the same.

It looks like there is indeed a software problem.

it endlessly displaying the last letter of the text too.

Maybe problem in library from DTRobot ?

If I comment this line :

//rtc.read();

LCD start work properly. (RTC of course not.)

The RTC library interferes with the operation of the LCD module.

But I use libraries from DFRobot …

Connections as in the picture:

Thank you for any help.