DS3231 Alarm 1 or 2 Interrupt Not Working Correctly

[Matrixv8]

Hi everyone, I have tried everything to get the alarm Interrupt working on the RTC DS3231. I am using an Arduino Uno R3 using I2C communication on C4 and C5. Everything works except the Alarm if I set the Alarm 1 on the seconds. IE: every minute on 20 seconds. I tried minutes as well and no interrupt. If I set the Alarm for every second, it works just fine. I am attaching an example of my program. If someone could help that would be great.

Note: I use a scope to monitor the Interrupt pin.

Than you,
Pierre

[Steve-Matrix]

Could it be the watchdog timer is resetting the chip?

[Matrixv8]

Thank you for the responce. The Arduino does not reset. I can programm all the function on the DS3231 chip including the date and time on the LCD display except the alarm 1 or 2 with the SQW/Int componet settings 1, 2 or 3. The 0 setting for the Int works fine at one trigger per second but not the other settings.

Pierre

[Matrixv8]

After doing many tests and programming with the DS3231 with the Arduino IDE it looks like my problem is that the alarm does not clear. I cannot find a reset alarm in the Flowcode V11 componet DS3231 . Can some one help?

Thank you.

[Matrixv8]

Okay I was able to use an I2C component to write to the DS3231 address location and register to set the alarm flag so the alarm resets. So I can use it in the flowcode I created. It works great.

Pierre