Help with Setting Up DS3231 RTC with ESPHome

Hardware DIY
1

Hey everyone,

I’m trying to integrate a DS3231 Real-Time Clock (RTC) module with ESPHome but I’m a bit stuck. I know that the DS3231 is compatible with the DS1307 platform in ESPHome, but I want to make sure I’m setting it up correctly.

Here’s what I’ve done so far:

  1. Configured the I²C bus on my ESP device:
i2c:
  sda: GPIO21
  scl: GPIO22

(Pins may vary depending on the board.)
2. Added the DS1307 time component (since DS3231 isn’t directly listed in ESPHome):

time:
  - platform: ds1307
    id: ds3231_time
    update_interval: 15min
  1. Set up SNTP synchronization to update the RTC from an external time source:
time:
  - platform: sntp
    id: sntp_time
    on_time_sync:
      then:
        - ds1307.write_time: ds3231_time
  1. Reading time from DS3231 on boot to make sure the ESP device gets the correct time on startup:
esphome:
  on_boot:
    then:
      - ds1307.read_time: ds3231_time

Now, my questions:

  • Is this the correct approach for using DS3231 with ESPHome?
  • Do I need to use any additional settings or modifications?
  • How do I ensure that the RTC keeps time properly if the ESP device loses power?

I’d appreciate any guidance or suggestions from the community! Thanks in advance.

2

Not sure if you are the same guy that posted on the HA forum (milo vs miloit), if not this might help:

3

Thank you no it’s not me…but I will try this