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Raspberry Pi OS • Re: How to use DS3231 alarm

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Ooops! In the /boot/firmware/config.txt I didn't have wakeup-source.

Code:

dtoverlay=i2c-rtc,ds3231,wakeup-source
I added it and rebooted and now:

Code:

$ ls /sys/class/rtc/rtc0alarmtimer.1.auto  dev     hctosys        name   since_epoch  time    wakealarmdate               device  max_user_freq  power  subsystem    uevent
wakealarm shows up.

Thanks
Chris

Statistics: Posted by chriskot870 — Fri Dec 12, 2025 11:30 pm



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