![]() ![]() This library uses the interrupt capability, so the square wave is not an option. ![]() The square wave might be fun as a blinking seconds indicator or something, but it shares the interrupt pin which is used for alarms. The temperature compensation function would only be needed in rare scientific applications, the DS3231’s internal compensation is more than accurate enough for an alarm clock. Ds3231 use as timer generator#Before you do, let me say that the library doesn’t provide any routines for the temperature compensation or square wave generator function of the DS3231. I welcome any constructive feedback you have on this code. Provide a heavily documented example of coding for those trying to improve their programming, Arduino or otherwise.Provide a DS3231 library C++ library which can be used in any application implementing an alarm clock. Ds3231 use as timer code#I wrote this code to accomplish two goals: This routine could also easily be made to sound a piezoelectric buzzer, turn lights on and off, anything you like. When an alarm is triggered, the routine in this code simply displays the alarm by flashing the screen until the user cancels the alarm. Or a 2-line display and a remote control. ![]() While this is all done on one screen here, you could easily build this with a seven segment display, two LEDs, and four PCB mount buttons. There are two indicators, one for each alarm, displaying whether that alarm is on or off. It also provides four buttons for the user: Set Time, Set Alarm 1, Set Alarm 2, and Turn Alarms On/Off. The clock as implemented here has a main screen which displays the time, day, and date. It can easily be adapted to another LCD screen, a 2-line LCD, or even seven-segment displays and LED indicators for output and pushbuttons for input. This code is written with an Arduino Mega2560 and a 9486-based 3.5″ LCD touchscreen.
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