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Press and hold the set button to scroll through the alarm hours setting quickly, or do a short press to advance to the next setting.
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Just don’t set an illegal date and all will be well! Thereafter, the date will roll over to 1 at the correct date for the set month. If you do, the clock will advance the date at midnight until the 31st is reached, then roll over to the first.
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However, you can set an illegal date for months with less than 31 days, like “February 30”. Note that the clock chip knows the correct number of days in each month. Press and hold the set button to scroll through the dates quickly, or do a short press to advance to the next setting.
LCD DS3231 ARDUINO UNO PINOUT CODE
LCD DS3231 ARDUINO UNO PINOUT INSTALL
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A unit that sounds continuously when power is applied is best, as the code generates a 5Hz interrupted voltage source to pin 10 on its own. If you use a piezo speaker instead of a piezo beeper, it will only click rapidly when the alarm is triggered. Be sure to use a piezo beeper (NOT a piezo speaker) that generates its own tone when 5 volts is applied. Connect the red wire from the piezo buzzer/beeper to pin 10 of the Arduino.