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  • Clock Set Date Time 4 days ago

    You have a library problem.
    Check that the "LiquidCrystal_I2C.h" library (https://github.com/fdebrabander/Arduino-LiquidCrystal-I2C-library) is well installed (read the instructions).
    Let me know

  • Alarm Clock 4 days ago

    I've never used an "RFID tag", but I think it can be done.
    I've seen several tutorials on the "RFID tag" and you should replace the "P4" button with the tag.
    Note that due to the "if (now.hour () == alarmHours && now.minute () == alarmMinutes)" the alarm itself turns off after 1 minute

  • Alarm Clock 18 days ago

    You do not need to change the wording from "RTC_DS1307 RTC;" to "RTC_DS3231 RTC;" it works very well the same.
    I can not change the code as you want, you have to work alone.
    I can give you some suggestions:
    LiquidCrystal_I2C lcd (0x27,20,4);
    0x27 is the I2c address of my display, to find yours, I suggest you read "http://playground.arduino.cc/Main/I2cScanner".
    20,4 says it is a display of 20 columns and 4 rows yours is 16,2
    To use a smaller display, you must enter less information (delete the day of the week, remove the wording "Date", "Time" and delete the seconds), doing so, put the date and time in the first line <dd/mm/yyyy hh:mm> (16 characters) and in the second the alarm.

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