RTC (Real-Time Clock) - HA OS 5.12 on RPi 4B

Community Guides
1

Materials and configurations:

  • RTC module DS1307 - see photo;
  • boot disk attached to PC & changes made in config.txt:
dtparam=i2c_vc=on
dtparam=i2c_arm=on
dtoverlay=i2c-rtc,ds3231

On restart (with complete unplug from power) with NO Internet connection see in HA Host log:

[    3.812698] rtc-ds1307 1-0068: registered as rtc0

And voila - time is correct.

20210419_100937
20210419_1009374032×2268 1.6 MB

2

Is this complete? ie: is info on disabling the fake hardware clock missing or not needed?

3

I’m not sure if it’s working on my side.
I see the RTC in the hardware section, but hwclock -r doesnt work on ssh…

4

image
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